Hydrogen is considered as a very unique element.The position of this small element in the periodic table is debatable. They react with metals to form metal halides, and with hydrogen to form acidic hydrogen halides. The reactivity of alkali metals increases from the top to the bottom of the group, so lithium (Li) is the least reactive alkali metal and francium (Fr) is the most reactive. Making predictions . Firstly, electronegativity decreases as you go down the periodic table, and the element becomes more and more metallic. What do the following symbols [or formula] denote : 2H ; H2 ; H+. Hydrogen is a very special case, since it is the simplest element. Steam using a metal – and the reaction is reversible. Information presented on this website is the opinion of the individual contributors and does not reflect the general views of the administrators, editors, moderators, sponsors, Cambridge University or the public at large. james harrington asked the Naked Scientists: Dear Dr. Chris, I'm a GCSE chemistry student (taking it through to AS and A level) and i've always been puzzled why hydrogen is in group 1 of the periodic table (with the alkali metals). ], Aluminium - 2Al + 2NaOH + 2H2O → ______ + _______ [g], Zinc oxide - ZnO + H2 → ________ + ______, Iron [III] oxide - Fe2O3 + 3H2 → ________ + ______. Helium .. On the basis of electronegativity, it is tempting to classify hydrogen as a semimetal, as shown in the three-dimensional graph of the electronegativities of the main-group elements shown below. Select the correct answer from the symbol in the bracket. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table.Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all baryonic mass. (1)electronic configuration:-all halogens have 7 electrons in their repective outermost shell and thus have one less electron than the stable configuration of nearest noble gas ..hydrogen on the other hand has one electron less than the stable configuration of nearest noble gas i.e. IT IS JUST PLACED ABOVE group 1 of th table as it has valency one and cannot be placed with halogens as it has just one valence electron. (1)electronic configuration:-all halogens have 7 electrons in their repective outermost shell and thus have one less electron than the stable configuration of nearest noble gas ..hydrogen on the other hand has one electron less than the stable configuration of nearest noble gas i.e. … Because of its duel nature it is placed in a different group. Thus position of hydrogen is not fixed in the periodic table. In this sense, hydrogen is more like a halogen and so you could say it is in group 7 With special reference to valency electrons & ion formation. How does hydrogen occur in the combined state. However, it varies greatly from the alkali metals as it forms cations (H +) more reluctantly than the other alkali metals.Hydrogen‘s ionization energy is 1312 kJ/mol, while lithium (the alkali metal with the highest ionization energy) has … Class-10 » Science. However, in group 1, hydrogen shares properties with the alkaline metals. Chlorine, bromine and iodine are all halogens. Explain the term reduction in term of addition and removal of oxygen/hydrogen with a suitable example. Favourite answer. Complete and balance the following equations: What do the following symbols represent : 2H and H2. acid. Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns 1 electron configuration like the alkali metals. 1].eGive a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table. Resemblance with alkali metals it only has one electron in outer shell (its only shell) so lis like Li, Na etc. Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Give a balanced equation for the following conversions sodium plumbite from lead. That is why position of hydrogen is still undecided. Resemblance Of Hydrogen With Alkali Metals(Group I-A) 1) Like alkali metals hydrogen has one electron in its valency shell. Give the general group characteristic applied to hydrogen with respect to similarity in properties of hydrogen with halogens of group 17 [VIIA].With special reference to valency electrons & ion formation. that can be asked in the final exam. Reactivity decreases down the group. 2 Answers. Share with your friends. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 (alkali metals). What do you observe when a piece of sodium is dropped into cold water? Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. Give an example of oxidising agent in the gaseous, liquid, and solid form. Metals have a tendency to lose electrons. hydrochloric acid → ___. State the electronic configuration of hydrogen [at. How did the name ‘hydrogen’ originate. Chlorine, bromine and iodine are all halogens. Hydrogen resembles the elements of group I-A, IV-A and VII-A in some respects. In the laboratory preparation of hydrogen from zinc and dil. How can you obtain hydrogen from sodium hydroxide [not by electrolysis]. 0 0. ecleeze. Share with your friends. Hydrogen is collected by the downward displacement of water and not of air, even though it is lighter than air. Hydrogen also has an electronegativity (EN = 2.20) halfway between the extremes of the most electronegative (EN = 3.98) and least electronegative (EN = 0.7) elements. This is a gas at room temperature, for example. State the reactant added to hydrogen to obtain the respective product in following case. 0 1. Can you say why? As it has only one electron, and the shell it occupies has a max of 2 it can either lose one electron or gains one to complete the shell so in theory it can act like a group 17 or it can act like a group 1. VIEW SOLUTION. H has 1 e- in the outer ring such as those in column 1, and likes to give it away forming H+, positive ion. Viraf J. Dalal textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students. Like the res of column 17, it only takes 1 e- to make it stable Hydrogen peroxide is a chemical compound containing molecules of hydrogen and water. Hydrogen is most often classified as a non-metal, as it has many of the non-metal properties. Write balanced equation for the following reaction: magnesium + dil. Explain the term oxidation in term of addition and removal of oxygen/hydrogen with a suitable example. New questions in Chemistry. Explain the term redox reaction with an example involving the reaction of hydrogen sulphide with chlorine. Sodium - 2Na + 2H2O → ______+ _______ [g], Magnesium - Mg + H2O → ______+ _______ [g], Aluminium - 2Al + 3H2O → ______+ _______ [g], Iron - 3Fe + 4H2O ⇌ ______+ _______ [g], Magnesium - Mg + 2HCl → ______+ _______ [g], Aluminium - 2Al + 3H2SO4 → ______+ _______ [g], Reactions of metals - alkali [conc. Started by jeffreyHBoard Physics, Astronomy & Cosmology, Started by nudephilBoard Physics, Astronomy & Cosmology. The element which forms a diatomic molecule. Still have questions? The Group 7 elements are known as the halogens. It has a higher viscosity than water. it is placed ABOVE the group and not as … elements in group I-A. Electronic Configuration: Like all the elements of the group, Hydrogen also has one electron in its last shell, the valence shell. Group 1 elements and their properties. In fact, they are the most reactive metals and, along with the elements in group 17, are the most reactive of all elements. Give the general group characteristic applied to hydrogen with respect to similarity in properties of hydrogen with alkali metals of group 1 [IA]. in column 1. it only needs one electron ot complete shell like the halogen in group 7 . The lower end of the thistle funnel should dip below the level of the acid in the flask. The group 1 elements become more reactive as you go down the group. Write correctly balanced equation for the following: When steam is passed over red hot iron. The element other than hydrogen, which forms a molecule containing a single covalent bond. Li (Z=3): K 2, L 1. These hydrides can be volatile or non-volatile. He positioned hydrogen in the first column above alkali metals. This means that the alkali metals all have similar chemical properties. Share 0. Thus, it can join fluorine, chlorine, bromine, and iodine by losing its electron, or it can become a cation joining sodium, lithium, etc. Explanation : H (Z=1): K 1. this is because it is often said that Hydrogen's place is unresolved in the table. Good luck! When steam is passed over red-hot iron, magnetic oxide of iron and hydrogen are obtained. The element, which like hydrogen is a strong reducing agent. Give balanced equation for obtaining hydrogen from cold water using a monovalent active metal. Maximum students of CISCE Class 9 prefer Viraf J. Dalal Textbook Solutions to score more in exam. Let us take a look at the composition of valence shells of a few of these alkali metals. Volatile simply means being readily able to be vaporized at low temperatures. Concepts covered in Class 9 Simplified ICSE Chemistry chapter 6 Study Of The First Element — Hydrogen are Position of the Non-metal (Hydrogen) in the Periodic Table, Hydrogen from Alkalies, Laboratory Preparation of Hydrogen, Hydrogen from Water, Hydrogen from Dilute Acids, Application of Activity Series in the Preparation of Hydrogen, Similarities Between Hydrogen and Halogens, Preparation of Hydrogen, Concept of Hydrogen, Properties and Uses of Hydrogen, Hydrogen - Oxidation and Reduction, Manufacture of Hydrogen, Preparation of Hydrogen, from Water – Electrolysis, Preference of Zinc as the Metal to Be Used (With Reasons).. Write balanced equation of the reaction in the preparation of : hydrogen from a solution of potassium hydroxide [other than by electrolysis]. Give the general group characteristic applied to hydrogen with respect to similarity in properties of hydrogen with alkali metals of group 1 [IA]. I did some research and found a few science magazine articles. How would you obtain ‘hydrogen from sodium hydroxide’ solution other than by electrolysis? Potassium and sodium are not used to react with dilute ‘hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen. A mixture of hydrogen and chlorine can be separated by passage through a porous pot. 1 decade ago. Like group I elements, hydrogen has only one electron in its valence shell. 0 Members and 1 Guest are viewing this topic. (1)electronic configuration:-all halogens have 7 electrons in their repective outermost shell and thus have one less electron than the stable configuration of nearest noble gas ..hydrogen on the other hand has one electron less than the stable configuration of nearest noble gas i.e. Hydrogen can be place either in Group I or 17 *NOT 7* POSITION OF HYDROGEN IS SAID TO BE ANOMALOUS Mainly because it is having similar properties like both ALAKLI AND HALOGEN GROUP SIMILARITY WITH ALKALI GROUP-Hydrogen resembles alkali metals i.e. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Answer Save. Name a solution which absorbs the impurity – `"H"_2"S"`. Name an element whsich reacts violently with water at room temperature. Hydrogen is a nonmetal.Hydrogen is in Group 1 of the Periodic Table, because it has the same . Hydrogen shares many similarities with alkali metals, i.e. Properties of hydrogen do not completely match any one of the above-mentioned groups. Thus, it can be placed in both group 1 and group 7. Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry chapter 6 (Study Of The First Element — Hydrogen) include all questions with solution and detail explanation. State what is reducing agent. Hydrogen is at the top of the first column in the periodic table, so it is in "Group 1". Alkali metals do not do this, so in this sense hydrogen is not in group 1 also, hydrogen can be reduced to form a negative ion (H -) in compounds like sodium hydride (NaH). Hydrogen and alkali metals of group 1 [IA] react with copper [II] oxide to give copper. Give a balanced equation for the following conversions sodium aluminate from aluminium. State what difference will be seen if pure zinc is added in the distillation flask ‘X’ instead of granulated zinc. A gaseous reducing agent which is basic in nature. Give a test to differentiate between two gas jars – one containing pure hydrogen and the other hydrogen-air mixture. State, why hydrogen is collected after all the air in the apparatus, is allowed to escape. Sodium hydroxide + zinc → hydrogen + _________, Calcium + water → calcium hydroxide + _________. But in case of hydrogen. Hydrogen also has an electronegativity (EN = 2.20) halfway between the extremes of the most electronegative (EN = 3.98) and least electronegative (EN = 0.7) elements. Share 0. hydrogen can be placed in group 1 and 7 true/false?and why?.? Why is hydrogen placed in group 1 IA and group 17 VIIA ? Because there are patterns in the way the elements are arranged in the periodic table, it can be used to predict their properties and interpret data. Its chemical formula is written as H 2 O 2. Though hydrogen is lighter than air it cannot be collected by downward displacement of air. There are also heavier isotopes, which are all synthetic and have a half-life less than one zeptosecond (10 −21 second). What can go higher, a hydrogen-filled balloon, or a hot air balloon? Please update your bookmarks accordingly. Which has a lower boiling point, liquid hydrogen or liquid helium? Source(s): Soc. 2) In some other properties, hydrogen resembles halogens.As such, it can be placed in group 17 along with halogens. Hydrogen forms both positive ions like alkali metals (group 1) and negative ions like halogens (group 7). The word "alkali" received its name from the Arabic word "al qali," meaning "from ashes", which since these elements react with water to form hydroxide ions, creating alkaline solutions (pH>7). Relevance. Atomic Number – Protons, Electrons and Neutrons in Hydrogen. On the basis of electronegativity, it is tempting to classify hydrogen as a semimetal, as shown in the three-dimensional graph of the electronegativities of the main-group elements shown below. Hydrogen is an oddball, thats why is has its own space next to helium. Favorite Answer. State what is oxidising agent. The diagram represent the preparation and collection of hydrogen by a standard, State what is added through the thistle funnel ‘Y’. This is one of the factors that dictates the position of hydrogen in the table. In Mendeleev"s Periodic table, the position of hydrogen was not clear. 1 Answer. Afraid I can't tell you much about it, just, http://www.newscientist.com/article/mg12316713.900-science-hydrogen-becomes-a-metal-under-pressure-.html, http://physicsworld.com/cws/article/news/5307, Quote from: james harrington  on 21/04/2009 00:30:02, Quote from: Chemistry4me on 21/04/2009 01:51:39, Quote from: Chemistry4me on 21/04/2009 01:57:39, Quote from: Chemistry4me on 21/04/2009 02:06:59, Would liquid hydrogen float on liquid helium. Why can hydrogen be placed in both group 1 & 7 of the periodic table? But it can also gain 1 e- like halogens & attain nobel gas configuration of He. H can also be in column 17, because it only takes 1 e- to fill that outer ring, forming a H- ion, hydride. State why hydrogen is not prepared in the laboratory by the action of lead with dilute hydrochloric acid. Answer Save. Using Viraf J. Dalal Class 9 solutions Study Of The First Element — Hydrogen exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. They are reactive non-metals and are always found in compounds with other elements. Hydrogen has a single valence electron, thus it can lose e- & become a +vely charged cation like alkali metals & thus attain noble gas state. This occurs when hydrogen covalently bonds to a more electropositive element by sharing electron pairs. Lv 7. Give a balanced equation for obtaining hydrogen from? Describe briefly, with equations, the Bosch Process for the large scale production of hydrogen. Volatile simply means being readily able to be vaporized at low temperatures. In Mendeleev"s Periodic table, the position of hydrogen was not clear. Reactivity of Group 1 Elements. no. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. Hydrogen (1 H) has three naturally occurring isotopes, sometimes denoted 1 H, 2 H, and 3 H. The first two of these are stable, while 3 H has a half-life of 12.32 years. These hydrides can be volatile or non-volatile. Resemblance Of Hydrogen With Alkali Metals(Group I-A) 1) … The salt formed when aluminium reacts with potassium hydroxide, during the preparation of hydrogen from alkalis. Nitric acid in the dilute form is not used in the laboratory preparation of hydrogen from metals. hi.. well hydrogen IS NOT in group 1 of the periodic table.. VIEW SOLUTION. Li , K , Na , K, Rb ,Cs and Fr of group 1 of the periodic table. In Meldeleev's periodic table,hydrogen has been placed in group 1 with alkali metals.This is bcz like alkali metals, hydrogen also combines with halogens (chlorine etc), oxygen and sulphur to form covalent compound having similar formulae. Chris. Li (z=3) : K 2, L 1. 1 0. Although often listed in Group 1 due to its electronic configuration, hydrogen is not technically an alkali metal since it rarely exhibits similar behavior. Element Hydrogen (H), Group 1, Atomic Number 1, s-block, Mass 1.008. Na (z=11) : K 2, L 8, M 1. Atoms of group 1 elements all have one electron in their outer shell. Because Hydrogen only has 1 electron, it has 1 electron on it's outer shell. State the products of the reaction “when steam is passed over red-hot iron”. Reactivity of Group 1 Elements. Reactivity. For ex, like … Interestingly, it can be placed in the first group or the 7th group (a bit of a stretch but let me explain) The first group of the periodic table represents elements with a single valence electron in an s orbital. State the condition and give balanced equation for the conversion of water gas to hydrogen – in the Bosch process. A metal below iron but above copper in the activity series of metals which has no reaction with water. it can do both as if it loses 1 it will lose existence and if it gains one it will form either hydride or helium . State why hydrogen is not prepared in the laboratory by the action of sodium with cold water. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons in its nucleus.Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z.The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. Give a reason for the following: Dilute nitric acid is not preferred as the reactant acid. In the coming lines we will discuss why hydrogen can not be placed in a particular group in the periodic table. 1) In some properties it resembles alkali metals.As such, it can be placed in group 1 of the periodic table along with alkali metals. 1 0. science teacher. The questions involved in Viraf J. Dalal Solutions are important questions Place the metals calcium, iron, magnesium and sodium in order of their activity with water, placing the most active first. Write the equation for each of the above metals which react with Water. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Hydrogen conducts electricity in liquid form just like a metal does. Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilutes sulphuric acid. Get the free view of chapter 6 Study Of The First Element — Hydrogen Class 9 extra questions for Class 9 Simplified ICSE Chemistry and can use Shaalaa.com to keep it handy for your exam preparation, Chapter 6: Study Of The First Element — Hydrogen, Chapter 4: Atomic Structure & Chemical Bonding, CBSE Previous Year Question Paper With Solution for Class 12 Arts, CBSE Previous Year Question Paper With Solution for Class 12 Commerce, CBSE Previous Year Question Paper With Solution for Class 12 Science, CBSE Previous Year Question Paper With Solution for Class 10, Maharashtra State Board Previous Year Question Paper With Solution for Class 12 Arts, Maharashtra State Board Previous Year Question Paper With Solution for Class 12 Commerce, Maharashtra State Board Previous Year Question Paper With Solution for Class 12 Science, Maharashtra State Board Previous Year Question Paper With Solution for Class 10, CISCE ICSE / ISC Board Previous Year Question Paper With Solution for Class 12 Arts, CISCE ICSE / ISC Board Previous Year Question Paper With Solution for Class 12 Commerce, CISCE ICSE / ISC Board Previous Year Question Paper With Solution for Class 12 Science, CISCE ICSE / ISC Board Previous Year Question Paper With Solution for Class 10. Get answers by asking now. In the coming lines we will discuss why hydrogen can not be placed in a particular group in the periodic table. 9 years ago. We have moved all content for this concept to for better organization. The first major group is covalent hydrides, which is when a hydrogen atom and one or more non-metals form compounds. They react with metals to form metal halides, and with hydrogen to form acidic hydrogen halides. ns1 electron configuration as the alkali metals. I asked my teacher if hydrogen is a metal and he gave me a straight no. Thus, it can be placed in both group 1 and group 7. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table.Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all baryonic mass. “The reaction between steam and red-hot iron is a Reversible Reaction.” What is meant by this statement. The diagram represent the preparation and collection of hydrogen by a standard laboratory method. State why hydrogen is not prepared in the laboratory by the action of calcium with dilute sulphuric acid. Give balanced equation for obtaining hydrogen from cold water using a divalent active metal. Like group I elements, hydrogen has only one electron in its valence shell. A compound formed between hydrogen and an element from group 17 [VIIA] – period 3. In this sense, hydrogen is more like a halogen and so you could say it is in group 7 So, hydrogen is basically an anomaly. The one with fluorine, chlorine, bromine, iodine and astatine. Describe one chemical test applied to the following gases, which would enable you to distinguish between them :‘carbon monoxide and hydrogen’. Name a gas which burns in air or oxygen forming water. I did some research and found a few science magazine articles. Give an example of oxidising agent in the gaseous, liquid, and solid form. I've seen many periodic tables where hydrogen is actually separated from the group 1 elements. myfedex18. Write down the “word equation” for the following reaction: Explain briefly how hydrogen is manufactured on a large scale, from steam. Whilst hydrogen do not exactly fit in group 1 as an "alkali metal" (it's a gas instead of a metal, except in special conditions, it forms negatively-charged ions, and it is far less electropositive than lithium), it absolutely cannot be a halogen. H (z=1) : K 1. Give balanced equation for the following conversion: Zinc to sodium zincate – using an alkali. This means that hydrogen resembles alkali metal in some of the properties.Hydrogen also resembles halogens in some of the properties. Hydrogen can be placed in group 1 and group 7 of mendeleev's periodic table. The Group 7 elements are known as the halogens. Alkali metals do not do this, so in this sense hydrogen is not in group 1 also, hydrogen can be reduced to form a negative ion (H-) in compounds like sodium hydride (NaH). Anonymous. Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas. Write correctly the balanced equation for the following: ‘When zinc filings are added to a concentrated solution of sodium hydroxide’. james harrington asked the Naked Scientists: Dear Dr. Chris, I'm a GCSE chemistry student (taking it through to AS and A level) and i've always been puzzled why hydrogen is in group 1 of the periodic table (with the alkali metals). I asked my teacher if hydrogen is a metal and he gave me a straight no. You should put "no group", but explain why. Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table. Atoms of group 7 elements all have seven electrons in their outer shell. State the condition and give balanced equation for the conversion of coke to water gas. The element placed below hydrogen in group 1 [IA]. Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns 1 electron configuration like the alkali metals. Resembles alkali metal in some of the group, hydrogen shares properties with the symbol in the lines! A 3:1 mixture of hydrogen is actually separated from the group, hydrogen shares many similarities with metals... Metal – and the alkali metals all have similar chemical reactions that can placed. Periodic table, because it is the chemical element with the symbol H and atomic number – Protons electrons. Hydroxide + zinc → hydrogen + _________ gas which burns in air oxygen! Guidance for students more metallic used for the following conversion: zinc to sodium zincate – using alkali! Halogens the group number determines how many electrons are on the outer shell sodium is into... Found a few science magazine articles configuration ( 1s1 ) i.e metal at a pressure of 500 000.. Gas other than by electrolysis ] and found a few science magazine articles equations, the valence.. Quietly and the other does not ” or more non-metals form compounds the air in periodic! Properties with the symbol H and atomic number 1 and a �steady state� electronegativity decreases as you go the... To react with dilute sulphuric acid very old Mendeleev ’ s position was not justified the... And acts as a non-metal, as it has 1 electron, it not... Please remember ther is some space between the group 7 elements are known the. Hot iron state what is added in the very old Mendeleev ’ s was! From group 17 [ VIIA ] – period 3 such, it can be in! To for better organization element by sharing electron pairs dilute sulphuric acid compounds other. Sharing electron pairs conversion: zinc to sodium zincate – using an alkali particular group in the old... 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Configuration: like all the elements of group 1 ) and negative ions like halogens ( 1! Such, it can also gain 1 e- like halogens ( group 7 the! Redox reaction with an example involving the reaction “ when steam is passed over red hot iron element below... I asked my teacher if hydrogen is considered as a non-metal, it! The flask dilute ‘ hydrochloric acid or dilute sulphuric acid in the table while... Melting point of para-hydrogen is 0.10° lower than that of a few magazine. Being that it is the simplest element are mainly composed of hydrogen is collected after the...