Question

(a) How does the atomic size vary on going down from top-bottom in a group of the periodic table? Why does it vary this way?

(b) Lithium sodium and potassium are all metals that react with water to liberate hydrogen gas is there any similarity in the atoms of these elements? Explain your answer.

Answer 1

(a) On going down in a group of the periodic table the atomic size increases when we move from top to bottom in a group a new shell of electrons is added to the atoms at every step due to which the size of atom increases.

(b) The similarity in the atoms of lithium sodium and potassium is that all of them have 1 valence electron each.