# Q. 1.     For the symbol $\inline H,D$ and $\inline T$ tabulate three sub-atomic particles found in each of them.

H, D, and T are the three isotopes of hydrogen with the same atomic number and different mass numbers of 1, 2 and 3 respectively.

 Element Symbol Number of Electrons Number of Protons Number of Neutrons Hydrogen H 1 1 0 Deuterium D 1 1 1 Tritium T 1 1 2

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