Which of the following particles are present in the nucleus of a helium atom?
Protons
Both protons & neutrons
Neutrons
Electrons
Helium atom has an atomic mass of 4 units and 2 protons in its nucleus. How many neutrons are present in its nucleus?
Select the sub-atomic particles that are present in the nucleus of an atom.
A. Electrons
B. Protons
C. Neutrons