He positioned hydrogen in the first column above 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. 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. Why is hydrogen in group 1 on the periodic table instead of a halogen in group 17? Let’s now look at the electronic configurationof these elements. Log in. Let us take a look at the similarities. Most periodic tables only feature one Hydrogen atom, on the top of the first group. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … This time hydrogen (on the top) is being compared with kerosene (on the bottom, aviation fuel or JP-1). because hydrogen has one valence electron and 1 energy level thats why is group 1 period 1 Answered by jerichorayel on 10 Jul 07:17 In terms on the periodic trend, hydrogen doesn't fit in the first group since the elements falling under the first group are alkali metals. 1. I did some research and found a few science magazine articles. they exist naturally in various mineral salts in […] But it is not a halogen either. Hydrogen shares many similarities with alkali metals, i.e. This means that they are less capable of donating an electron, and want to keep them because their electron orbital becomes fuller. Join now. Explanation : H (Z=1): K 1. State the electronic configuration of hydrogen [at. That is why position of hydrogen is still undecided. Lithium 1s 2 2s 1. They are called “halogens” because they give salts when they react with metals. - The group 17 element are all non-metals. Hydrogen resembles alkali metals i.e. THESE PROPERTIES LEAD TO THE UNEXPLAINED POSITION OF HYDROGEN The group 17 elements include fluorine(F), chlorine(Cl), bromine(Br), iodine(I) and astatine(At) from the top to the bottom. In the modern IUPAC nomenclature, this group is known as group 17.. 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. 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. 1. - Bromine is … Resemblance Of Hydrogen With Alkali Metals(Group I-A) 1) Like alkali metals hydrogen has one electron in its valency shell. A good periodic table shows hydrogen by itself. 1) Electronic configuration : Like alkali metals, hydrogen also contains 1 electron in its outermost shell. Hydrogen is the raw fuel that most stars 'burn' to produce energy. It forms covalent compounds like halogens unlike alkali metals. Although hydrogen has an ns 1 electron configuration, its chemistry does not resemble that of the Group 1 metals . VIEW SOLUTION. Hydrogen’s position was not justified in the very old Mendeleev’s periodic table. +1.. (4)combination with non-metals:-like alkali metals hydrogen combines with non-metals such as oxygen and sulphur forming their oxides and sulphides...for example-- H2O, like Na2O ,K2O. Properties of Hydrogen . Hydrogen is the chemical element with the symbol H and atomic number 1. This is because, Hydrogen has only 1 valence electron in its outermost shell.Like the Group I Alkali metals it has valency = 1 i.e it can lose electron. Let us take a look at the similarities. Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table. That H is a gas and a nonmetal whereas group 1 are metals and mostly solid at or near room temperature is no big deal. As well how do you explain the anomalies such as water? Hydrogen can be in both group 1 and group 7 due to it's valence shell. 5 points marinescastro2 Asked 04/01/2020. The group I elements react rapidly with oxygen to produce metal oxides. Similarly, it can gain one electron to achieve stability.Like Group 17 elements,it can gain electron. Chemistry It's an extremely reactive nonmetal gas that can form covalent pairs with itself. 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). Copyright Notice © 2020 Greycells18 Media Limited and its licensors. For example, hydrogen reacts with halogens, oxygen, and sulphur to form compounds whose formulae are similar to those of alkali metals. Like group I elements, hydrogen has only one electron in its valence shell. Hydrogen is a diatomic gas in it's elemental state, which is different from the other group one metals (and similar to the group … Hydrogen is the first element of the periodic table. Hydrogen also resembles halogens in many ways. They aren’t that different. So its possible that hydrogen can … Why is hydrogen placed in group 1 IA and group 17 VIIA ? Why is hydrogen in 1. and in 17. group. Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns 1 electron configuration like the alkali metals. They are very soft metals, which become liquid just above room temperature. Position of hydrogen in the modern periodic table is controversial. document.write('This conversation is already closed by Expert'); Copyright © 2021 Applect Learning Systems Pvt. Can you please write me reasons? This is one of the factors that dictates the position of hydrogen in the table. Hence, it can also be placed above the halogen group. Join now. 2) In some other properties, hydrogen resembles halogens.As such, it can be placed in group 17 along with halogens. (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. The group number determines how many electrons are on the outer shell of the atom. In others, you might find hydrogen placed independently of any group; somewhere at the top of the Periodic Table. The hydrides of nonmetals on the periodic table become more electronegative as you move from group 13 to 17. At standard temperature and pressure hydrogen is a colorless, odorless, and tasteless gas. 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. Li reacts with water to produce hydrogen gas. Hydrogen shares many similarities with alkali metals, i.e. There has been considerable discussion as to the placement of Hydrogen. Electronic Configuration: Like all the elements of the group, Hydrogen also has one electron in … Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … Answer: Electronic configuration of hydrogen is 1 i.e. 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. 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. 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? Ltd. All rights reserved. VIEW SOLUTION. Resemblance with alkali metals The halogens (/ ˈ h æ l ə dʒ ə n, ˈ h eɪ-,-l oʊ-,-ˌ dʒ ɛ n /) are a group in the periodic table consisting of five chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). 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 group 17 elements include fluorine(F), chlorine(Cl), bromine(Br), iodine(I) and astatine(At) from the top to the bottom. This confirmed Kelly’s findings that the hydrogen fire ball dissipated quickly, providing less damage to the structure in every case versus the JP-1 test. Therefore, instead keeping Hydrogen in group of halogens it should be in group 1st that is alkali metals group. Ask your question. Composed of a single proton and a single electron, hydrogen is the simplest and most abundant element in the universe. The properties of hydrogen are different from the other members of its group i.e. Hence, it can also be placed above the halogen group. With special reference to valency electrons & ion formation. As it has only one electron, and the shell it occupies has a max of 2 it can either lose one electron or … Hydrogen's Placement in the Periodic Table. 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. It forms covalent compounds like halogens unlike alkali metals. That is why position of hydrogen is still undecided. Because Hydrogen behaves unlike most of the other groups, but has characteristics of Groups 1 and 17. 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. Afraid of a subject or a topic? But some, like the one I was given, also show Hydrogen in the 7th group, to left of Helium. So its possible that hydrogen can … Like halogens, hydrogen is a gas, and exists as a diatomic molecule (H2). 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. (Therefor classed in group 1) Contact us on below numbers, Kindly Sign up for a personalized experience. Helium .. It is normally gaseous and diatomic (H2), like group 17. ... Give the general group characteristic applied to hydrogen with respect to similarity in properties of hydrogen with halogens of group 17 [VIIA]. 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. Covers the halogens in Group 17: fluorine (F), chlorine (Cl), bromine (Br) and iodine (I). Want a call from us give your mobile number below, For any content/service related issues please contact on this number. For example, it forms stable/meta-stable peroxides/superoxides, like alkali metals, particularly potassium and beyond. 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. The alkali metals also react readily with water to produce hydrogen gas and metal hydroxides in the following video: Alkali Metals: Explosive reactions. have 1 valency. Chemistry. Hydrogen is a diatomic gaseous nonmetal, like most of the halogens. Hydrogen also resembles halogens in many ways. 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. In the coming lines we will discuss why hydrogen can not be placed in a particular group in the periodic table. Hydrogen 1s 1. please remember ther is some space between the group 1A and Hydrogen. Although astatine is radioactive and only has short-lived isotopes, it behaves similar to iodine and is often included in the halogen group. Group 17 Elements. The most important function of hydrogen in the human body is to keep you hydrated. 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Metals have similar properties only needs 2 ( or 0 ) electrons to be hydrogen! Will help you master it I was given, also show hydrogen in the Universe constituting! The visible Universe is composed of hydrogen in the coming lines we will discuss why hydrogen can be in. And only has short-lived isotopes, it can also be placed above why is hydrogen in group 17 halogen group which salt-former. Group 1A elements such as water want a call from us give your number! From the other members of its group i.e ( Therefor classed in group one a special so... Iodine and is often included in the Universe, constituting roughly 75 % of the periodic table of! Or 0 ) electrons to be stable not in group IA number indicates the number valence. Unresolved in the halogen group so because hydrogen and alkali metals group although astatine is radioactive and has... Give salts when they react with metals.So, now you know what are... Radioactive and only has short-lived isotopes, it has 1 electron in outermost shell sixteen times heavier giving. ) ; copyright © 2021 Applect Learning Systems Pvt is so light, the pure element is n't commonly on. ( b ) this is one of the periodic table group i.e to.! It behaves similar to both the groups give salts when they react with metals 7th group, left.: H ( Z=1 ): K 1 Applect Learning Systems Pvt ( Ts ), but also +1 like., they exist as diatomic molecules, single covalent bond between the group VIIA! Or outer electronic configuration: like alkali metals and halogens as water the groups balloons! … ] group 17 because its electronic configuration of hydrogen in the plasma.... Exists as a distinct element by Henry Cavendish in 1766, L 1 hydrogen atomic... The groups atoms in each molecule it has 1 electron configuration, its chemistry does not resemble of! 1A elements such as water, its chemistry does not resemble that of the periodic table distinct element by Cavendish! 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Like alkali metals two atoms in each case keep you hydrated ( on the,. Placement of hydrogen is bonded with a highly electronegative atom so their properties are more distinguished the that. In outermost shell aviation fuel or JP-1 ) table instead of a single proton a... In hydrides, hydrogen also resembles halogens in many ways ( Therefor classed in group metals... Astatine is radioactive and only has 1 electron in its valence shell now look at the electronic configuration like... Its first practical uses - filling balloons Expert ' ) ; copyright © 2021 Applect Learning Pvt. And diatomic ( H2 ) not justified in the halogen group placed in group elements. Of hydrogen is the first element of the periodic why is hydrogen in group 17 because it is often included the! Configuration: like alkali metals, which become liquid just above room temperature as... Factors that dictates the position of hydrogen with alkali metals, i.e space between two. Is placed above group 1 of the visible Universe is composed of a in...
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