Question

Why hydrogen behaves both as a halogen and as an alkali metal? ​

Answer 1

Hydrogen behaves both as a halogen and as an alkali metal due to following resemblance:

(i) Resemblance with halogens:

(a) It is non-metal.

(b) It is gas like F2 and Cl2.

(c) It is electronegative in nature.

(d) it is electronegativity and ionization energy is similar to halogens.

(e) it is liberated at anode when NaH is electrolyzed.

(ii) Resemblance with alkali metals:

(a) Its electronic configuration (1s1 ) is similar to alkali metals.

(b) It is reducing agent like alkali metals.

(c) It is lose one electron to form H+ ion like alkali metal.

(d) It is liberated at cathode when HCl electrolyzed.

(e) It is electropositive like alkali metals.