Question

unit 5 comprehensive quiz l
which of the following elements has the smallest atomic radius?
si
s
cl
p

Explanation:

Atomic radius decreases across a period (from left to right) in the periodic table. The elements \(Si\), \(P\), \(S\), and \(Cl\) are in the same period (period 3). Their atomic numbers are \(Si = 14\), \(P=15\), \(S = 16\), \(Cl=17\). As the atomic number increases across the period, the effective nuclear charge increases, pulling the electrons closer to the nucleus. So, the atomic radius decreases.

Answer:

\(Cl\)