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Hydrogen shows the properties of both 1st and 7th groups:

Resemblance Of Hydrogen With Alkali Metals(Group I-A)

  1. 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:

  1. Both Hydrogen and Halogens require one electron to complete their valence shell.
  2. Both hydrogen and Halogens are non-metals (Except iodine which has partial metallic character).
  3. Both hydrogen and Halogens acts as negative ions when combined with metals.
  4. Their molecules are diatomic.
  5. 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.

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