Question
Name the isotopes of hydrogen. Write their atomic composition schematically and explain which of these is radioactive ?
✓
Answer
i. Hydrogen has three isotopes i.e., hydrogen $\left({ }_1^1 H \right)$, deuterium $\left({ }_1^2 H \right)$ and tritium $\left({ }_1^3 H \right)$ with mass numbers $1,2$ and $3$ respectively.
ii. They all contain one proton and one electron but different number of neutrons in the nucleus.
iii. Atomic composition of isotopes of hydrogen:
iv. Tritium is a radioactive nuclide with half-life period $12.4$ years and emits low energy $\beta^–$ particles.v. Schematic representation of isotopes of hydrogen is as follows:
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