Which one of the following has the smallest radius?
A)K
B)Br
C)Fe
D)Sr

Question

Quizplus · Accepted Answer

The size of an atom gradually increases from top to bottom and decreases from left to right in the periodic table. Therefore, K (potassium) which is located in the fourth period (row) and the first column of the periodic table is larger than Br (bromine) which is located in the fourth period and the seventh column. Fe (iron) is located in the fourth period and the eighth column, so it is smaller than K but larger than Br. Sr (strontium) is located in the fifth period and the second column, so it is larger than Fe but smaller than K. Therefore, Br has the smallest radius among the given options.

Which One of the Following Has the Smallest Radius