Question

The electronic configuration which corresponds to a noble gas is

• A. 2, 2
• B. 2, 8, 2
• C. 2, 8, 5
• D. 2, 8, 8

Answer 1

The correct option is D

2, 8, 8

The noble gas are the elements that have completely filled valence shells. The noble gas belongs to group 18.

Explanation for the correct option:

Except for helium, all other elements have 8 electrons in the valence shell.

So, the electronic configuration of noble gas is 2, 8, 8.

Explanation for the incorrect option:

Group 2 elements contain 2 electrons in the valence shell.

Electronic configuration of 2, 2 belongs to group 2.

Electronic configuration of 2, 8, 2 belongs to group 2.

Electronic configuration of 2, 8, 5 belongs to group 15.

Final answer:

Hence, option (D) is the correct option.