Chemistry · Atomic Structure
Identify the true statement with respect to the mass number of an atom.
- 1It is the sum of the number of protons and electrons.
- 2It is always exactly equal to the atomic number.
- 3It remains the same for all isotopes of a given element.
- 4It is the sum of the number of protons and neutrons.✓
Correct answer
It is the sum of the number of protons and neutrons.
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