Question

write the number of neutron in CL

Answer 1

there are 17 electron, 17 proton and 18 neutron in chlorine atom

Answer 2

There are two isotopes of chlorine:

1. one with atomic mass 35
number of protons in Chlorine= 17
number of neuton = 35 - 17 = 18

2. other with atomic mass 37.
number of protons in Chlorine= 17
number of neuton = 37 - 17 = 20

Thus, number of neutrons in Chlorine can be 18 or 20.