# How many neutrons are found in the nucleus of one atom of chlorine-37?

Apr 16, 2018

$20$

#### Explanation:

the $- 37$ after the name chlorine shows the number of nucleons - the protons and neutrons found in the nucleus.

the proton number shows the number of protons in the atom. this is found at the bottom-left of the element symbol in the Periodic Table. for chlorine, this is $17$.

therefore, the number of neutrons in an atom of chlorine can be found by subtracting the proton number of chlorine from the mass number of chlorine.

$37 - 17 = 20$

there are $20$ neutrons, $17$ protons and therefore $37$ nucleons in one atom of chlorine$- 37$.