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.
[tex]1s^22s^22p^3[/tex]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
