2
4
3
1
Answer is Wrong!
Answer is Right!
The correct answer is C. Deuterium has a mass number of 2. This means that the nucleus of a deuterium atom contains 2 protons and 1 neutron. The other options are incorrect. Option A is incorrect because the mass number of helium is 4. Option B is incorrect because the mass number of tritium is 3. Option D is incorrect because the mass number of hydrogen is 1.
Deuterium is a stable isotope of hydrogen.
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