Favourite answer. Granulated zinc is preferred to metallic zinc in the preparation of hydrogen using dilute acid. Write correctly the balanced equation for the following: ‘When zinc filings are added to a concentrated solution of sodium hydroxide’. They react with metals to form metal halides, and with hydrogen to form acidic hydrogen halides. Electronic Configuration: Like all the elements of the group, Hydrogen also has one electron in its last shell, the valence shell. Shaalaa.com has the CISCE Class 9 Simplified ICSE Chemistry solutions in a manner that help students grasp basic concepts better and faster. What do you observe when a piece of sodium is dropped into cold water? This occurs when hydrogen covalently bonds to a more electropositive element by sharing electron pairs. Hydrogen can be placed in group 1 and group 7 of mendeleev's periodic table. Hydrogen is the only electro-positive non metal and it has valency of 1.formula of hydrogen when reacts with oxygen is water this is the one of the main reason for placing the hydrogen in group i.Group 1 because it has only one 1 shell,Period 1 because it has one electron on its last shell. hi.. well hydrogen IS NOT in group 1 of the periodic table.. Still have questions? Why? 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. Reactivity of Group 1 Elements. 2) In some other properties, hydrogen resembles halogens.As such, it can be placed in group 17 along with halogens. The questions involved in Viraf J. Dalal Solutions are important questions Non-remnant stars are mainly composed of hydrogen in the plasma state.The most common isotope of hydrogen, termed … Properties of hydrogen do not completely match any one of the above-mentioned groups. 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. “The reaction between steam and red-hot iron is a Reversible Reaction.” What is meant by this statement. Why can hydrogen be placed in both group 1 & 7 of the periodic table? Share 0. … 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. Lv 7. [two atoms, molecule, ion], Write a correctly balanced equation for the following “word equation”:calcium + water → calcium hydroxide + hydrogen. State why hydrogen is not prepared in the laboratory by the action of calcium with dilute sulphuric acid. 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. (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 is a nonmetal.Hydrogen is in Group 1 of the Periodic Table, because it has the same . On newer periodic tables, that is 1 and 17. H can also be in column 17, because it only takes 1 e- to fill that outer ring, forming a H- ion, hydride. First and foremost reason being that it is similar to alkali metals in electronic configuration(1s1) i.e. 1 decade ago. This means that the halogens all have similar chemical reactions. The element which forms a diatomic molecule. That is why position of hydrogen is still undecided. hydrochloric acid → ___. Hydrogen is the chemical element with the symbol H and atomic number 1. The first major group is covalent hydrides, which is when a hydrogen atom and one or more non-metals form compounds. 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. Hydrogen shares many similarities with alkali metals, i.e. State what is oxidising agent. 1 decade ago. Of these, 5 H is the most stable, and 7 H is the least. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. Na (z=11) : K 2, L 8, M 1. The diagram represent the preparation and collection of hydrogen by a standard, State what is added through the thistle funnel ‘Y’. Explain the term reduction in term of addition and removal of oxygen/hydrogen with a suitable example. I did some research and found a few science magazine articles. I did some research and found a few science magazine articles. 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. 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. Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas. Hydrogen conducts electricity in liquid form just like a metal does. 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). State why hydrogen is not prepared in the laboratory by the action of sodium with cold water. The Group 7 elements are known as the halogens. Complete and balance the following equations: What do the following symbols represent : 2H and H2. Resemblance Of Hydrogen With Alkali Metals(Group I-A) 1) Like alkali metals hydrogen has one electron in its valency shell. State what is reducing agent. How would you obtain ‘hydrogen from sodium hydroxide’ solution other than by electrolysis? Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 (alkali metals). Give balanced equation for obtaining hydrogen from cold water using a monovalent active metal. 1 0. science teacher. Metals have a tendency to lose electrons. When steam is passed over red-hot iron, magnetic oxide of iron and hydrogen are obtained. Hydrogen is a very reactive gas, and the alkali metals are even more reactive. 10 years ago. it only has one electron in outer shell (its only shell) so lis like Li, Na etc. 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. This will clear students doubts about any question and improve application skills while preparing for board exams. Group 1 elements and their properties. Li (z=3) : K 2, L 1. Hydrogen is most often classified as a non-metal, as it has many of the non-metal properties. Give a test to differentiate between two gas jars – one containing pure hydrogen and the other hydrogen-air mixture. Write balanced equation for the following reaction: magnesium + dil. Non-remnant stars are mainly composed of hydrogen in the plasma state. The lower end of the thistle funnel should dip below the level of the acid in the flask. Its chemical formula is written as H 2 O 2. Helium .. Let us take a look at the similarities. 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. 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. In Mendeleev"s Periodic table, the position of hydrogen was not clear. These hydrides can be volatile or non-volatile. this is because it is often said that Hydrogen's place is unresolved in the table. How does hydrogen occur in the combined state. A metal below iron but above copper in the activity series of metals which has no reaction with water. Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table. The group 7 elements are all reactive non-metals. The salt formed when aluminium reacts with potassium hydroxide, during the preparation of hydrogen from alkalis. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 (alkali metals). In the coming lines we will discuss why hydrogen can not be placed in a particular group in the periodic table. Get answers by asking now. Favorite Answer. What can go higher, a hydrogen-filled balloon, or a hot air balloon? Give a balanced equation for the following conversions sodium aluminate from aluminium. Reactivity of Group 1 Elements. State the condition and give balanced equation for the conversion of water gas to hydrogen – in the Bosch process. The group number determines how many electrons are on the outer shell of the atom. please remember ther is some space between the group 1A and Hydrogen. Let us take a look at the composition of valence shells of a few of these alkali metals. State why hydrogen is not prepared in the laboratory by the action of lead with dilute hydrochloric acid. Give an example of oxidising agent in the gaseous, liquid, and solid form. Give a balanced equation for the following conversions sodium plumbite from lead. They are reactive non-metals and are always found in compounds with other elements. Give balanced equation for obtaining hydrogen from cold water using a divalent active metal. But in case of hydrogen. Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns 1 electron configuration like the alkali metals. 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. A gaseous reducing agent which is basic in nature. Explain the term redox reaction with an example involving the reaction of hydrogen sulphide with chlorine. They react with metals to form metal halides, and with hydrogen to form acidic hydrogen halides. Give a balanced equation for the following conversion. I've seen many periodic tables where hydrogen is actually separated from the group 1 elements. The alkali metals cannot do this. They could have just as easily chucked it into group 17 eh? Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilutes sulphuric acid. This means that hydrogen resembles alkali metal in some of the properties.Hydrogen also resembles halogens in some of the properties. Thus position of hydrogen is not fixed in the periodic table. The alkali metals cannot do this. Give balanced equation for the following conversion: Zinc to sodium zincate – using an alkali. Li (Z=3): K 2, L 1. Place the metals calcium, iron, magnesium and sodium in order of their activity with water, placing the most active first. These hydrides can be volatile or non-volatile. They react with metals to form metal halides, and with hydrogen to form acidic hydrogen halides. Hydrogen can be in both group 1 and group 7 due to it's valence shell. single electron in outermost shell. I asked my teacher if hydrogen is a metal and he gave me a straight no. Resemblance Of Hydrogen With Alkali Metals(Group I-A) 1) … In fact, they are the most reactive metals and, along with the elements in group 17, are the most reactive of all elements. Source(s): Soc. The group 7 elements are all reactive non-metals. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. The diagram represent the preparation and collection of hydrogen by a standard laboratory method. Li , K , Na , K, Rb ,Cs and Fr of group 1 of the periodic table. 0 1. In Mendeleev"s Periodic table, the position of hydrogen was not clear. Chlorine, bromine and iodine are all halogens. State the condition and give balanced equation for the conversion of coke to water gas. Like the res of column 17, it only takes 1 e- to make it stable Additional Questions | Q 2.1. How did the name ‘hydrogen’ originate. But it can also gain 1 e- like halogens & attain nobel gas configuration of He. ns1 electron configuration as the alkali metals. H has 1 e- in the outer ring such as those in column 1, and likes to give it away forming H+, positive ion. Hydrogen can be placed in group 1 and group 7 of mendeleev's periodic table Why - Science - NCERT Solutions; Board Paper Solutions; Ask & Answer; School Talk; Login; GET APP; Login Create Account. 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. but in Theoretical calculations predict that hydrogen can behave like a metal at a pressure of 500 000 atm. Relevance. Sodium hydroxide + zinc → hydrogen + _________, Calcium + water → calcium hydroxide + _________. (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. 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). acid. However, in group 1, hydrogen shares properties with the alkaline metals. Element Hydrogen (H), Group 1, Atomic Number 1, s-block, Mass 1.008. Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. In this sense, hydrogen is more like a halogen and so you could say it is in group 7 Give the general group characteristic applied to hydrogen with respect to similarity in properties of hydrogen with alkali metals of group 1 [IA]. Started by jeffreyHBoard Physics, Astronomy & Cosmology, Started by nudephilBoard Physics, Astronomy & Cosmology. Properties of Hydrogen . Relevance. Write balanced equation of the reaction in the preparation of : hydrogen from a solution of potassium hydroxide [other than by electrolysis]. Select the correct answer from the symbol in the bracket. When hydrogen peroxide is in its pure form it is usually seen as a clear liquid with a slight pale blue colouration. 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).. Na (Z=11): K 2, L 8, M 1 Name a gas which burns in air or oxygen forming water. (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. Does taking hydrogen from water for energy deplete water supplies. Write down the “word equation” for the following reaction: Explain briefly how hydrogen is manufactured on a large scale, from steam. 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. The melting point of para-hydrogen is 0.10° lower than that of a 3:1 mixture of ortho-hydrogen and para-hydrogen. Chlorine, bromine and iodine are all halogens. Write correctly balanced equation for the following: When steam is passed over red hot iron. Hydrogen only needs 2 (or 0) electrons to be stable. The one with fluorine, chlorine, bromine, iodine and astatine. Like group I elements, hydrogen has only one electron in its valence shell. This is a gas at room temperature, for example. Chris. Name a gas other than hydrogen collected by the same method. Give the general group characteristic applied to hydrogen with respect to similarity in properties of hydrogen with alkali metals of group 1 [IA]. A compound formed between hydrogen and an element from group 17 [VIIA] – period 3. Share with your friends. This is one of the factors that dictates the position of hydrogen in the table. 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. Share 0. Hydrogen is a very reactive gas, and the alkali metals are even more reactive. Describe briefly, with equations, the Bosch Process for the large scale production of hydrogen. State the products of the reaction “when steam is passed over red-hot iron”. The rest of the elements in this group are usually known as the "alkaline metals", but hydrogen is not generally described this way. What do the following symbols [or formula] denote : 2H ; H2 ; H+. State what difference will be seen if pure zinc is added in the distillation flask ‘X’ instead of granulated zinc. Class-10 » Science. Atomic Number – Protons, Electrons and Neutrons in Hydrogen. This occurs when hydrogen covalently bonds to a more electropositive element by sharing electron pairs. This means that the alkali metals all have similar chemical properties. There are also heavier isotopes, which are all synthetic and have a half-life less than one zeptosecond (10 −21 second). no. In fact, they are the most reactive metals and, along with the elements in group 17, are the most reactive of all elements. Hydrogen is considered as a very unique element.The position of this small element in the periodic table is debatable. 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. Why is copper not used to prepare hydrogen by the action of dilute hydrochloric acid or dilute sulphuric acid on the metal, [copper [Cu] below hydrogen – no reaction]. 9 years ago. It is in group 1 … Because of its duel nature it is placed in a different group. Hydrogen’s position was not justified in the very old Mendeleev’s periodic table. Electronic Configuration: Like all the elements of the group, Hydrogen also has one electron in its last shell, the valence shell. Two jars of H2 are collected – “one burns quietly and the other does not”. Hydrogen has a single valence electron, thus it can lose e- & become a +vely charged cation like alkali metals & thus attain noble gas state. A mixture of hydrogen and chlorine can be separated by passage through a porous pot. 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. The first major group is covalent hydrides, which is when a hydrogen atom and one or more non-metals form compounds. Volatile simply means being readily able to be vaporized at low temperatures. Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns 1 electron configuration like the alkali metals. Thus, it can be placed in both group 1 and group 7. 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 . Conversion of water gas to hydrogen – in the laboratory preparation of hydrogen by standard. Following reaction: magnesium + dil hydrogen be placed in both group 1 [ IA ] react with sulphuric! 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With chlorine separated by passage through a porous pot with an example of oxidising in... Element placed below hydrogen in the periodic table, so it is in 1!: H ( Z=1 ): K 1 its valency shell ion.! Hydrogen only has one valence electron last shell, the Bosch process for the of... Ot complete shell like the alkali metals ( group 7 you go down the table... The reaction between steam and red-hot iron, magnetic oxide of iron and hydrogen are obtained answer to the added!