For some elements , there are various forms possible , which have different number of neutron and same number of protons , are referred to as the isotopes .
The three isotopes possible for the element hydrogen are -
Protium , Deuterium and Tritium .
Where ,
Protium has one electron , one proton and zero neutron.
Deuterium has one electron , one proton and one neutron.
Tritium has one electron , one proton and two neutron.
The most abundant isotope observed is Protium , with 99.98% abundance.
