Metallic Character
The ability of an atom to donate electrons and form positive ion (cation) is known as electropositivity or metallic character. Down the group, metallic character increases due to increase in atomic size and across the period, from left to right electropositivity decreases due to decrease in atomic size.
Non-Metallic Character
The ability of an atom to accept electrons to form a negative ion (anion) is called non-metallic character or electronegativity. The elements having high electro-negativity have a higher tendency to gain electrons and form anion. Down the group, electronegativity decreases due to increase in atomic size and across the period, from left to right electronegativity increases due to decrease in atomic size

Which of the following reason correctly justifies that “Fluorine (72pm) has smaller atomic radius than Lithium (152pm)”?

Options

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. Fa nd Li are in the same period and across the period atomic size/radius decreases from left to right.

Answer

D

Explanation

and Li are in the same and across the period atomic size/dacius decreases from left to right