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Answer :
Isotope | Symbol | Mass no. | Atomic no. | No. of electrons | No. of protons | No. of neutrons |
Hydrogen | H | 1 | 1 | 1 | 1 | 0 |
Deuterium | D | 2 | 1 | 1 | 1 | 1 |
Tritium | T | 3 | 1 | 1 | 1 | 2 |