Q.4. (a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
Yes, they have the following similar properties:
(1) Belongs to the same group I in the periodic table.
(2) Have 1 valence electron in the valence shell.
(3) All are alkali metals.
(4) They are highly reactive.