Question

Which of the following reason correctly justifies that “Fluorine (72pm) has smaller atomic radius than Lithium (152pm)"?
a) F and Li are in the same group. Atomic size increases down the group
b) F and Li are in the same period. Atomic size increases across the
period due to increase in number of shells
c) F and Li are in the same group. Atomic size decreases down the group
d) F and Li are in the same period and across the period atomic size/radius
decreases from left to right.​

Answer 1

'd' is a correct answer.

Answer 2

Explanation:

d) F and Li are in the same period and across the period atomic size/radius

decreases from left to right.