How many neutrons and protons are there in the following nuclei?
How many neutrons and protons are there in the following nuclei?

Ans: 

24 is the mass number.

The number of protons in an atom equals the number of atoms in the atom.

Mass number – Atomic number = 24 – 12 = 12 neutrons

Numerical value of mass nubmer = 56

Number of protons in iron Equals atomic number of iron = 26

Mass number – Atomic number = 56 – 26 = 30 neutrons

88 is the mass number.

The number of protons in an atom is equal to 38.

88 – 38 = 50 neutrons = mass number – atomic number