When a sulphur atom becomes a sulphide ion,

Elements having different nuclear charge but the same mass number are called

The two stable isotopes of carbon present in naturally occurring carbon are

Isotopes of the same element have the same number of

The nuclides (a nuclide is the general name for any nuclear species) $_6C^{12}$,$_{26}Fe^{56}$,and $_{92}U^{238}$ have $12$,$56$,and $238$ nucleons respectively in their nuclei. The total number of nucleons in a nucleus is equal to:

The expression $Ze$ gives :