In the third period of the periodic table, sodium is followed by magnesium, aluminum, silicon, and phosphorus. Which of these elements has the smallest atomic size?

A. sodium

B. magnesium

C. aluminum

D. silicon

E. phosphorus

Answer:-

Phosphorus

Explanation:-

In the third period among the elements given, phosphorus is at the most right side among them in the periodic table.

We know that as we go from left to right in the periodic table, the atomic size decreases due to the increase in nuclear charge.

Hence phosphorus is the smallest among them

phosphorus