Question

Question #43205

Answer 1

`Z = 7`
`E = 7`
`N = 13`

Explanation:

The atomic number `Z` is the same as the proton number, so we know that nitrogen must by definition have `7` protons.

If it is an atom, and not an ion, then it must have `Z = E`, protons equals electrons, so it must also have `7` electrons for no overall charge.

The mass number is given by `A = Z + N`, protons plus neutrons, so we can say that `N = A - Z`, neutrons is mass minus protons, so there are `20-7=13` neutrons.