# Question #7701f

Sep 13, 2017

10

#### Explanation:

In a neutral atom, where charge is zero, the number of protons is equal to the number of electrons. Since the charge of one electron is (-1) and of one proton is (+1) so their number should be equal so that the charge will balance out

$\rightarrow$ number of electron in a neutral fluorine atom is equal to number of protons in a neutral atom
$\text{number of protons"="number of electron} = 9$

Since in your example the fluorine atom is not neutral, and has a charge of -1, then there is one extra electron that gave the atom the charge,
$\rightarrow \text{number of electrons" = "number of protons} + 1 = 9 + 1 = 10$