Question

Calculate the number of neutron in the chlorine.
a) 17c135
b) 17c137

Answer 1

Answer:

Each proton and neutron has a relative mass of 1 unit. Therefore we can subtract the number of protons from the atomic mass number in order to work out the number of neutrons. Chlorine has a mass number of 35, minus the 17 protons means that chlorine has 18 neutrons.

Explanation:

Since we know that the mass of Chlorine is

35

, its atomic number is

17

and atomic number is the same as the proton it contains. Subtract the number of protons to the atomic