Question

which sequence of elements is arranged from smallest to largest atomic radius?
o a) s, p
o p, al, s
o s, p, al
o p, s, al

Explanation:

Step1: Recall atomic radius trends

Atomic radius increases down a group and decreases across a period.

Step2: Locate elements in periodic table

• \(Al\) (Aluminum) is in period 3, group 13.
• \(Si\) (Silicon) is in period 3, group 14.
• \(P\) (Phosphorus) is in period 3, group 15.
• \(S\) (Sulfur) is in period 3, group 16.
• \(Al\) has the largest atomic radius among them as it is left - most in the period.
• \(S\) has the smallest atomic radius among them as it is right - most in the period.
• So the order from smallest to largest is \(S < P < Si < Al\)

Answer:

A. \(Al, Si, P\)