Question

The atomic numbers of 4 elements A, B, C and D are 8, 9, 10 and 11 respectively. The order of their atomic volume is

• A. A > B > C < D
• B. A < B < C > D
• C. A > B < C < D
• D. A < B > C > D

Answer 1

The correct option is A

A > B > C < D

Explanation for Correct option:

A) Atomic numbers 8,9,10,11 are Oxygen(O), Fluorine(F), Neon(Ne), Sodium(Na) respectively.

Atomic volume decreases in a period from left to right due to the increase in the effective nuclear charge and increases in a group from top to bottom due to the increase in the atomic size.

O, F, Ne belong to second period where as Na belongs to third period which has 3 shells so, the order of atomic volume is O > F> Ne < Na.

Explanation for Incorrect options:

B) A < B < C > D - O< F< Ne< Na - this shows the decrease and increase trend in atomic volume.

C)A > B < C < D - O > F < Ne < Na - this shows the increase and decrease trend in atomic volume.

D)A < B > C > D - O < F > Ne > Na - this shows the decrease and increase trend in atomic volume.

Hence,A) is the correct option- the order of atomic volume is O > F> Ne < Na.