Chemistry · Atomic Structure
What is defined as the mass number of an atom?
- 1The sum of the number of protons and neutrons in the nucleus of an atom.✓
- 2The total number of electrons in an atom.
- 3The sum of the number of protons and electrons in an atom.
- 4The total number of neutrons in the nucleus of an atom.
Correct answer
The sum of the number of protons and neutrons in the nucleus of an atom.
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