(i) List one property in which hydrogen resembles alkali metals and one property in which hydrogen resembles halogens.

(ii) Also list a property in which hydrogen differs from both alkali metals and halogens.

(i) Both alkali metals and hydrogen act as reducing agents.

CuO + H₂ ⟶ Cu + H₂O

CuO + 2Na ⟶ Cu + Na₂O

Both halogens and hydrogen are non-metals. They show electronegative character.

H + e^- ⟶ H^-

F + e^- ⟶ F^-

(ii) Hydrogen atom has only one shell but alkali metal and halogens have two or more shells.