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The numbers of protons, electrons and neutrons in a molecule of heavy water are respectively:

1. 8, 10, 11
2. 10, 10, 10
3. 10, 11, 10
4. 11, 10, 10

Correct answer: 10, 10, 10

Solution

D2O: two deuterium atoms give 2 protons, 2 neutrons, 2 electrons; oxygen-16 gives 8 protons, 8 neutrons, 8 electrons. Totals are 10 protons, 10 electrons, 10 neutrons.

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