He did so because hydrogen and alkali metals have similar properties. 2) In some other properties, hydrogen resembles halogens.As such, it can be placed in group 17 along with halogens. Understand the Modern periodic law, periods and rows, and trends in period... Study of early attempts of classification, Mendeleev's periodic table-Achi... Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day. 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. Why is hydrogen placed in group 1 IA and group 17 VIIA ? The most important function of hydrogen in the human body is to keep you hydrated. Contact us on below numbers, Kindly Sign up for a personalized experience. Electronic Configuration: Like all the elements of the group, Hydrogen also has one electron in … The alkali metals also react readily with water to produce hydrogen gas and metal hydroxides in the following video: Alkali Metals: Explosive reactions. - The group 17 element are all non-metals. - Bromine is … Add your answer and earn points. In the modern IUPAC nomenclature, this group is known as group 17.. Ask your question. It forms covalent compounds like halogens unlike alkali metals. Let us talk about hydrogen, a very interesting element, with an instructive video! As the radius of the atom increases down group 17 from top to bottom, and the valence shell electrons are increasingly shielded, the positively charged nucleus exerts less of an attractive force on the electrons so it has less ability to attract electrons towards itself, hence, electronegativity decreases down the group from top to bottom. ; Group 17 elements can combine with nearly all the elements in the periodic table. Hydrogen can also be placed in Group 17, because it can acquire a second electron to form a hydride ion, H-, just as the other elements in Group 17 can form 1- ions. Why is hydrogen in 1. and in 17. group. THESE PROPERTIES LEAD TO THE UNEXPLAINED POSITION OF HYDROGEN Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Hydrogen can be in both group 1 and group 7 due to it's valence shell. Because Hydrogen only has 1 electron, it has 1 electron on it's outer shell. please remember ther is some space between the group 1A and Hydrogen. Group 17 elements are also known as: (a) halogens (2) (name still in common use) (b) Group VIIA (name no longer used) Group 17 elements are non-metals; Group 17 elements exist as diatomic molecules (X 2) when not combined with other elements. 3) In some hydrogen differs from both alkali metals and halogens. In fact, they are the most reactive metals and, along with the elements in … Hydrogen can be placed in group 1[1A] as it forms a positive ion as in HC1 like alkali metals H. Question 2. It forms covalent compounds like halogens unlike alkali metals. It is estimated that 90% of the visible universe is composed of hydrogen. The hydrides of nonmetals on the periodic table become more electronegative as you move from group 13 to 17. Resemblance with alkali metals Hydrogen only needs 2 (or 0) electrons to be stable. For example, hydrogen reacts with halogens, oxygen, and sulphur to form compounds whose formulae are similar to those of alkali metals. As it has only one electron, and the shell it occupies has a max of 2 it can either lose one electron or … This lightness of hydrogen made it a natural for one of its first practical uses - filling balloons. 1) Electronic configuration : Like alkali metals, hydrogen also contains 1 electron in its outermost shell. The byproduct of a hydrogen and oxygen explosion is water or H 2 O. Hydrogen gas is made up of diatomic molecules designated as H 2. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … Hydrogen - Hydrogen - Reactivity of hydrogen: One molecule of hydrogen dissociates into two atoms (H2 → 2H) when an energy equal to or greater than the dissociation energy (i.e., the amount of energy required to break the bond that holds together the atoms in the molecule) is supplied. The group 17 elements include fluorine(F), chlorine(Cl), bromine(Br), iodine(I) and astatine(At) from the top to the bottom. Clean Energy Group raises concerns about harmful NOx emissions from new industry plans to burn hydrogen in fossil fuel power plants; calls for pause in permitting proposals until independent public health investigations are conducted -- particularly to study potentially dangerous air pollution impacts in environmental justice communities. Similar to group 17, it will attract one electron to complete its shell. It is normally gaseous and diatomic (H2), like group 17. this is because it is often said that Hydrogen's place is unresolved in the table. Ltd. All rights reserved. Because hydrogen forms compounds with oxidation numbers of both +1 and -1, many periodic tables include this element in both Group IA (with Li, Na, K, Rb, Cs, and Fr) and Group VIIA (with F, Cl, Br, I, and At). Indeed, some versions of the periodic table place hydrogen above fluorine in Group 17 because the addition of a single electron to a hydrogen atom completes its valence shell. Li (Z=3): K 2, L 1 state 3 reasons why hydrogen can be placed in group 1 or group 17 - Chemistry - TopperLearning.com | 47lxjtll They are called “halogens” because they give salts when they react with metals. Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table. Can you please write me reasons? H + Log in. between group 14,15, and 16 there is a patern between the boiling points with the boiling point being higher for the higher group- but group 17 dosn't fit the pattern it has lower boiling point then group 15 - why? Hydrogen is the chemical element with the symbol H and atomic number 1. Electronic Configuration: Like all the elements of the group, Hydrogen also has one electron in … Hydrogen's Placement in the Periodic Table. There are many reasons for including hydrogen among the elements in Group IA. So, now you know what halogens are! The group I elements react rapidly with oxygen to produce metal oxides. The prime components of air, nitrogen and oxygen, are fourteen and sixteen times heavier, giving hydrogen dramatic buoyancy. Group 17 Elements. Physical and Chemical Properties of Group 17 Elements Group 17 Elements: The Halogens The elements in Group 17 are: Fluorine Chlorine Bromine Iodine Astatine These elements are known as halogens. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns 1 electron configuration like the alkali metals. Hydrogen shares many similarities with alkali metals, i.e. Hydrogen also resembles halogens in many ways. THESE PROPERTIES LEAD TO THE UNEXPLAINED POSITION OF HYDROGEN. Explanation : H (Z=1): K 1. it has le, IP in nucleus. Copyright Notice © 2020 Greycells18 Media Limited and its licensors. In the coming lines we will discuss why hydrogen can not be placed in a particular group in the periodic table. Join now. Hence, it can also be placed above the halogen group. Hydrogen is an oddball, thats why is has its own space next to helium. (1)electronic configuration :- like alkali metals hydrogen also contains one electron in its outermost shell... hydrogen's electronic configuration = 1s1, lithium' electronic configuration = 1s2 2s1, sodium's electronic configuration = 1s2 2s2 2p6 3s1, (2)electropositive character:- like alkali metals hydrogen also looses its only one electron to form hydrogen ion ,H(+). A conceptual question: In Chemistry, Hydrogen has always been regarded as an "outlier" of sorts--exhibiting the characteristics of family 1 elements yet only have one valence electron filling the 1s orbital. Hydrogen is the raw fuel that most stars 'burn' to produce energy. Like group I elements, hydrogen has only one electron in its valence shell. no. resempblence with halogens(Group -17 or Group VII)--- (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. Let us take a look at the similarities. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. So its possible that hydrogen can … All rights reserved. Because hydrogen forms compounds with oxidation numbers of both +1 and -1, many periodic tables include this element in both Group IA (with Li, Na, K, Rb, Cs, and Fr) and Group VIIA (with F, Cl, Br, I, and At). Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table. Although astatine is radioactive and only has short-lived isotopes, it behaves similar to iodine and is often included in the halogen group. Let’s now look at the electronic configurationof these elements. They aren’t that different. Hence, it can also be placed above the halogen group. 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. 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. (3)ionization energy:-ionization enrgy of hydrogen is similar to that of halogens but much higher than alkali metals.. for example ionizaion energy of H = 1312 kj/mole, ionizaion energy of F(a halogen) = 1681 kj/mole, ionizaion energy of Cl(a halogen) = 1255 kj/mole, ionizaion energy of Na (an alkali metal) = 496 kj/mole, ionizaion energy of K (an alkali metal) = 419 kj/mole. 1].e Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table. Li , K , Na , K, Rb ,Cs and Fr of group 1 of the periodic table. Such that in the chart below comparing boiling points of groups 14-17 hydrides, the values of ammonia (NH 3), water (H 2 O), and hydrogen fluoride (HF) break the increasing boiling point trend. Afraid of a subject or a topic? Composed of a single proton and a single electron, hydrogen is the simplest and most abundant element in the universe. it can also gain an electron to achieve the nobles gas arrangement and hence it can behave similar to group 17 which is halogen family. A good periodic table shows hydrogen by itself. Hydrogen is a diatomic gaseous nonmetal, like most of the halogens. Want a call from us give your mobile number below, For any content/service related issues please contact on this number. Hydrogen shares many similarities with alkali metals, i.e. Hydrogen is a very reactive gas, and the alkali metals are even more reactive. They are called “halogens” because they give salts when they react with metals.So, now you know what halogens are! They are very soft metals, which become liquid just above room temperature. Sodium 1s 2 2s 2 2p 6 3s 1. THESE PROPERTIES LEAD TO THE UNEXPLAINED POSITION OF HYDROGEN Get the answers you need, now! Although hydrogen has an ns 1 electron configuration, its chemistry does not resemble that of the Group 1 metals . elements in group I-A. This means that they are less capable of donating an electron, and want to keep them because their electron orbital becomes fuller. Let us take a look at the similarities. So to be stable Hydrogen loses its electron and makes 1 positive charge. 2) Electropositive character: Like alkali metals ,hydrogen also loses its only electron to form hydrogen ion i.e. Hydrogen's Placement in the Periodic Table. (b) This is because halogens are reactive non-metals. Explanation : H (Z=1): K 1. Hydrogen is considered as a very unique element.The position of this small element in the periodic table is debatable. Covers the halogens in Group 17: fluorine (F), chlorine (Cl), bromine (Br) and iodine (I). In others, you might find hydrogen placed independently of any group; somewhere at the top of the Periodic Table. Because Hydrogen behaves unlike most of the other groups, but has characteristics of Groups 1 and 17. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. The group number determines how many electrons are on the outer shell of the atom. 1. (5)Like alkali metals hydrogen also act as a strong reducing agent .. resempblence with halogens(Group -17 or Group VII)---. Group 1A elements such as H, Li, K,etc. As well how do you explain the anomalies such as water? Like halogens, hydrogen is a gas, and exists as a diatomic molecule (H2). It has 1 electron in its outer (only) shell, so it is placed above group one. hi.. well hydrogen IS NOT in group 1 of the periodic table.. Hydrogen also resembles halogens in many ways. (Therefor classed in group 1) Hydrogen’s position was not justified in the very old Mendeleev’s periodic table. 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' ) ; copyright © 2021 Applect Learning Systems Pvt considerable discussion as to the Placement hydrogen... Placed above the halogen group proton and a single proton and a single proton and a single,! Sodium 1s 2 2s 2 2p 6 3s 1 K 2, L 1 hydrogen 's atomic number is,! 1A ] and group 17 elements diatomic molecule ( H2 ), also. It behaves similar to those of alkali metals State the electronic configurationof these.... Ther is some space between the two atoms in each case dictates the position of hydrogen is a and! K 1 metals ( group I-A ) 1 ) like alkali metals thats why is hydrogen placed above group of. That dictates the position of hydrogen in the plasma State valency shell stars '. Coming lines we will discuss why why is hydrogen in group 17 can be placed in a particular group in the periodic table i.e. A colorless, odorless, and want to keep them because their electron orbital becomes.! 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