Hydrogen only has one proton. A Hydrogen-3 atom contains one proton and 2 nuetrons. This is because atoms of a certain element can vary in the amount of nuetrons. The're called isotopes.
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Argon has 22 neutrons.
Hydrogen typically has 0 neutrons.
Indium has 66 neutrons.
the average amount of neutrons in chlorine is 18, but there could be more or less with the different isotopes
Number of neutrons is 48 (mass number) minus 21 (proton number) = 27 (neutron number)