Question

(a) Arrange the following as per the instructions given in the brackets
(ii) Mg, Cl, Na, S, Si (Decreasing order of atomic size)

Answer 1

Atomic size:-

• Atomic size basically refers to the radius to the atom.
• It increases down the group. Across a period the atomic radius first decreases and then increases.
• Decreasing order of atomic size- $\mathrm{Na}>\mathrm{Mg}>\mathrm{Si}>\mathrm{S}>\mathrm{Cl}$.