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Isotopes and isobars

1.Isotopes:
Atoms of an element which contain the same atomic number but different mass numbers are called isotopes.For example,there are three isotopes of hydrogen having mass 1,2and 3 respectively and each of them having atomic number equal to named as protium, deuterium and tritium respectively.Ordinary hydrogen is protium.
2.Isobars:
Atoms of different elements which contain the same mass number but different atomic numbers are called isobars.For example,argon and calcium are isobars having same mass number 40 but different atomic numbers 18 and 20 respectively.

3.Isotones:Atoms of different elements which contain the same number of neutrons but different atomic numbers and mass numbers are called isotones.For example,carbon and nitrogen are isotones having same neutrons 8 but different atomic numbers 6 and mass numbers 14 and 15.
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