The number of neutrons in the nucleus of plutonium nuclide ( ₉₄Pu²⁴²) is :

The mass number of a nucleus is

The number of maximum electrons in N shell is

What is the maximum number of electrons in the M-Shell ?

The atoms, in which the number of protons is same but the number of neutrons is different, are known as –

The Nucleus of Helium has –