How Many Protons, Neutrons, And Electrons Do Helium Have?

Helium is the first element of eighteenth group of periodic table. It is a noble gas and its symbol is He. The atomic mass of helium is 4. Its atomic number is 2.

Number of protons = atomic number

So,

Number of protons = 2

In a neutral atom, the number of protons is equal to the number of electrons. Therefore;

Number of electrons = 2

Number of neutrons = atomic mass - atomic number

Number of neutrons = 4 - 2

Number of neutrons = 2