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Hydrogen has three isotopes: protium (¹H), deuterium (²H or D) and tritium (³H or T). They have nearly same chemical properties but different physical properties. They differ in (1) Number of protons (2) Atomic number (3) Electronic configuration (4) Atomic mass

1. Number of protons
2. Atomic number
3. Electronic configuration
4. Atomic mass

Correct answer: Atomic mass

Solution

The isotopes of hydrogen differ in atomic mass because they have varying numbers of neutrons, which affects their overall mass while maintaining the same number of protons and electrons.

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