Question

Which of the following represents the elements in the order of increasing atomic radius?

• A. I < Br < CI
• B. Na < Mg < C
• C. C < N < CI
• D. Li < Na < K

Answer 1

The correct option is D

Li < Na < K

The atomic radius of a chemical element is a measure of the size of its atom, usually the mean or typical distance from the center of the nucleus to the outermost isolated electron

1. along the period atomic radius decreases
2. down the group atomic radius increases

option d only shows the elements down the group

ie.,

lithium (Li) atomic number:3

sodium (Na) atomic number: 11

potassium (K) atomic number: 19

Hence, Option (d) is correct.