isotopes first of all detected by J.J Thomson in 1912-13 during the study of properties of neon. Most of the elements are mixture of several isotopes. Isotopes of hydrogen are given special names i-e protium, deuterium and tritium.
(ii) Definition:
Atoms of same element having same atomic number but different atomic masses.
OR
Atoms having same numbers of protons but different number of neutrons.
(iii) Type of Isotopes:
1. Protium.
2. Deuterium.
3. Tritium.
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