Which of the following represents the correct electronic configuration of nitrogen?

Correct answer: (c) 2, 5

Explanation

Nitrogen has atomic number 7, so its 7 electrons fill the first shell (2) and leave 5 in the second: the configuration is 2, 5.

The options 2, 8, 5 (15 electrons) and 2, 8, 7 (17 electrons) belong to phosphorus and chlorine.