Question

determine the number of protons, neutrons, and electrons in the following atoms:
a. hydrogen atom that has a mass number of 1
b. a sulfur atom that has a mass number of 32

Answer 1

Mass number is the sum of proton and neutron, while the atomic number represents the number of protons only

Now in an atom to maintain the electroneutrality equal number of electrons should be present as proton.

The atomic number of the atoms can be obtained from Periodic Table.And it is to be remembered that in atom presence of protons is the first priority than neutron, that means for the formation of atomic nucleas proton is for important although neutrons may exist in excess amount but proton should be there.

From Periodic table The atomic number of Hydrogen is =1

and the mass number is also =1, so there present 1 proton, 1 electron and 0 neutron

From Periodic table Sulfur has atomic number =16

the given mass number is =32 ,so the number of proton = 16, electron = 16, neutron =16