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Why is the position of hydrogen not fixed in the activity series?
Wiki User
∙ 13y ago
Hydrogen shows the properties of both 1st and 7th groups:
Resemblance Of Hydrogen With Alkali Metals(Group I-A)
- Like alkali metals hydrogen has one electron in its valency shell.
Explanation
H (Z=1): K1
Li (Z=3): K2, L1
Na (Z=11): K2, L8, M1
(2) Valance shell electronic configuration of hydrogen and alkali metal is same.
Explanation
H (Z=1): 1S1
Na (Z=11): 1S2,2S2,2P6,3S1
3) Both hydrogen an alkali metals are good reducing agents.
4) Like alkali metals hydrogen can also form halides.
Explanation: Hydrogen has capability to form Cation and least electronegative than halogens. For example:
Hydrogen: HCl, HI.
I-A: NaCl, KBr.
Resemblance with Halogens:
- Both Hydrogen and Halogens require one electron to complete their valence shell.
- Both hydrogen and Halogens are non-metals (Except iodine which has partial metallic character).
- Both hydrogen and Halogens acts as negative ions when combined with metals.
- Their molecules are diatomic.
- Like Halogens, hydrogen can also form both ionic and covalent bond.
Explanation: Hydrogen is least metallic as compared to other 1st group metals. For example:
Hydrogen: NaH (ionic), CH4 (Covalent)
Halogens: NaCl (ionic), HCl
Hydrogen can receive maximum one electron to complete its octet to form anion and get give one
electron only to form cation. Therefore cannot be fixed in single group.
Wiki User
∙ 11y ago
Wiki User
∙ 13y agodue to its resemblence with both metals and non-metals i.e it has one valance electron
Wiki User
∙ 13y agoIf you mean, why is Hydrogen sometimes detached from the rest of the Group 1A in the Periodic Table, that is because it is a gas while the others are Alkali METALs.
Wiki User
∙ 11y agobecause it proprties are both like metal and nonmetal
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