The mass number of chlorine is 35 and atomic number is 17.
Number of neutrons is equal to the mass number - number of protons.
It means it has 35-17= 18 Neutrons.
Similarly, in case of carbon atomic number is 6 and its mass number is 12. hence, the number of protons is 6 and the number of neutrons is also 6.
Bromine has atomic number 35 which means it has 35 protons and 46 neutrons.
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