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If an isotope of hydrogen has two neutrons in its atom, its atomic number and atomic mass number will respectively be

1. 2 and 1
2. 3 and 1
3. 1 and 1
4. 1 and 3

Correct answer: 1 and 3

Solution

The atomic number of hydrogen is always 1, as it has one proton. If the isotope has two neutrons, its mass number will be 1 (proton) + 2 (neutrons) = 3.

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