Question

Find the Protons, Electrons and Neutrons for an atom with the atomic number of 56 and mass number 137

Answer 1

The number of protons and electrons is equal to the atomic number. So there are 56 protons and electrons. The sum of neutrons and protons is the mass number. So 137 - 56 = 81 neutrons.

Number of Protons: 56
Number of Electrons: 56
Number of Neutrons: 81