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Isotopes are distinct nuclear species (or nuclides) of the same chemical element. They have the same atomic number (number of protons in their nuclei) and position in the periodic table (and hence belong to the same chemical element), but differ in nucleon numbers (mass numbers) due to different numbers of neutrons in their nuclei. While all isotopes of a given element have similar chemical properties, they have different atomic masses and physical properties.
The three naturally occurring isotopes of hydrogen. The fact that each isotope has one proton makes them all variants of hydrogen: the identity of the isotope is given by the number of protons and neutrons. From left to right, the isotopes are protium (1H) with zero neutrons, deuterium (2H) with one neutron, and tritium (3H) with two neutrons.
three isotopes
There are three isotopes of hydrogen namely, protium 11H, deuterium 21H or D and lastly tritium 31H or T. The isotopes are different because of the different number of neutrons present in them. Out of these three isotopes of hydrogen, only tritium is radioactive in nature which emits low-energy beta particles.
