Which of the following has the correct arrangement of atoms in order of increasing atomic radius? A). Mg, Na, P, Si, Ar
B). Ar, Mg, P, Na, Si
C.) Na, P, Si Mg, Ar
D.) Ar, P, Si, Mg, Na

The correct answer is - option D.  Ar, P, Si, Mg, Na

Explanation:

The atomic radius of an atom can be defined as half of the distance of the nucleus of two atoms in a diatomic molecule which is represented by r. This can be measure by measuring the distance of the nuclei in a diatomic molecule and divide it by 2.

Argon (Ar) - 0.71 Å

Phosphorus (P) - 0.98 Å

Silicon (Si) - 1.11 Å

Magnesium (Mg) - 1.45 Å

Sodium (Na) - 1.9 Å

Atmic radii is decreses as moving from left to right across a period in periodic table.