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Hydrogen has three isotopes. What is the total number of distinct diatomic hydrogen molecules (H2-type) that can be formed from these isotopes?

1. 3
2. 6
3. 9
4. 10

Correct answer: 6

Solution

Three isotopes: ¹H (H), ²H (D), ³H (T). Distinct molecules: HH, HD, HT, DD, DT, TT. Total = 6.

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