Here's why:

* Atomic Number: Nitrogen has an atomic number of 7, meaning it has 7 protons and 7 electrons.

* Electron Configuration: The electrons are arranged in shells around the nucleus. The first shell can hold up to 2 electrons, and the second shell can hold up to 8. Nitrogen's electron configuration is 2,5 (meaning 2 electrons in the first shell and 5 in the second).