Question

which of the following has the smallest atomic radius?
a ga
b b
c al
d n
e f

Explanation:

Step1: Recall atomic - radius trend

Atomic radius decreases across a period (left - to - right) and increases down a group (top - to - bottom) in the periodic table.

Step2: Locate elements in periodic table

Ga (Gallium) is in Group 13 and Period 4. B (Boron) is in Group 13 and Period 2. Al (Aluminum) is in Group 13 and Period 3. N (Nitrogen) is in Group 15 and Period 2. F (Fluorine) is in Group 17 and Period 2.

Step3: Compare based on trends

Among these elements, elements in Period 4 (Ga) will be larger than those in Period 2 and 3 due to more electron shells. Among B, Al, N, and F, since they are in Period 2, and atomic radius decreases from left - to - right across a period, F is the right - most element among them.

Answer:

e. F