Question

What electron configuration represents Nitrogen?A. 2,4B. 2,8,4C. 2,5D. 2,2

Answer 1

Nitrogen is an element from group 15 and the second period. Its atomic number is 7, which means it has 7protons and 7 electrons in the neutral state.

Let's use the general electron configuration rule to figure out the configuration for Nitrogen.

`1s^22s^22p^3`

If we sum up the exponents, which refer to the number of electrons in each sublevel, we get to the number of electrons, which is 7 for Nitrogen.

To answer this question, we must consider only levels instead of sublevels. So on level 1 there are 2 electrons and on level 2 there are 2 + 3 = 5 electrons. Therefore we get to the answer:

C. 2, 5