Carbon can have 6, 7 or 8 neutrons.

how would you write their names?

carbon-12

carbon-13

carbon-14

Explanation:

This is because carbon atoms with the usual 6 neutrons have a mass number of 12 (6 protons + 6 neutrons = 12)., while carbon atoms with 7 neutrons have an atomic mass of 13 (6 protons + 7 neutrons = 13). Based off of this, the carbon atom with 8 neutrons will most likely have a mass number of 14.