Question

The increasing order of the atomic radius of $Si,S,Na,Mg,Al$ is:

• A. S<Si<Al<Mg<Na
• B. Na<Al<Mg<S<Si
• C. Na<Mg<Si<Al<S
• D. Na<Mg<Al<Si<S

Answer 1

Answer: (A)

S<Si<Al<Mg<Na

The increasing order of the atomic radius of Si, S, Na, Mg, Al is
$S<Si<Al<Mg<Na$
All of these elements belong to the third period of the periodic table.
On moving from left to right across the period, the atomic radius decreases.