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Hydrogen is a group seven element or group one element?....since it contains the properties of group one and seven

Hydrogen is a group seven element or group one element?....since it contains the properties of group one and seven


3 Answers

Bhargavi V Jaiswal
15 Points
7 months ago
hey there ! 
Position of an element in periodic table depends upon its electronic configuration and properties. Hydrogen resembles the elements of group I-A, IV-A and VII-A in some respects. Properties of hydrogen do not completely match any one of the above-mentioned groups. That is why position of hydrogen is still undecided, but because of the study purpose and maintaing regularity  It is placed seperately above group 1 elements and not WITH group 1 elements .. 
hope it helps
Pawan Prajapati
askIITians Faculty 8741 Points
7 months ago
Answer ::

Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns1 electron configuration like the alkali metals. However, it varies greatly from the alkali metals as it forms cations (H+) more reluctantly than the other alkali metals.

*It resembles halogens in forming diatomic molecules. It does not behave like halogens, being mainly in the +1 oxidation state.
* It does not happen to be like halogens, (the most stable compounds of halogens have either -1 or a very high oxidation state like -7 or +5).

Anthony Paul Villy
35 Points
18 days ago

Hydrogen shows properties of both group 1 and group 17.

Here are some properties of hydrogen.

  1. Resemblance with alkali metals:-
    1. Electronic configuration: Hydrogen like alkali metals has one electron in it's valence shell.
    2. Electropositive character: Hydrogen like alkali metals is electropositive because it can lose one electron readily to form hydrogen ion (H+).
    3. Valency and oxidation state: Like alkali metals hydrogen also shows an oxidation state of +1 in it's compounds.
    4. Combination with electronegative elements: Like alkali metals, hydrogen forms binary compounds with electronegative elements such as halogens, oxygen, and sulfur.
    5. Liberation at cathode: When the fused salts of alkali metals are electrolysed, metal ions are liberated at the cathode. In a similar manner, hydrogen is liberated at the cathode on subjecting the aqueous solutions of it's salts to electrolysis.
    6. Reducing agent: Like alkali metals, hydrogen acts as a strong reducing agent.
  2. Resemblance with halogens:-
    1. Electronic configuration: Like halogens hydrogen has only one electron less than the nearest Noble gas configuration.
    2. Ionisation enthalpy: The ionisation enthalpy of hydrogen is quite close to that of halogens.
    3. Electronegative character: Hydrogen like halogens had tendency to accept electron to form monovalent anion. By accepting an electron hydrogen as well as halogens acquire Noble gas configuration.
    4. Oxidation state: Like halogens hydrogen exhibits oxidation state of -1 in it's compounds.
    5. Diatomic nature: Hydrogen molecule (H2) is diatomic like halogens molecules (F2,Cl2,Br2,I2).
    6. Liberation at anode: When fused with alkali metal hydrides such as lithium or sodium hydride is electrolysed hydrogen is liberated at the anode. This is in the same way as halogens are liberated at anode when fused with alkali metal halides are electrolysed.
    7. Non-metallic character: Like halogens hydrogen is non-metallic in nature.
    8. Nature of compound: Like halogens hydrogen combined with non-metals such as carbon, silicon, germanium, etc. to form covalent compunds.

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