Science · Chemistry
What is the atomic number of an element?
- 1The number of protons in the nucleus of an atom of that element.✓
- 2The sum of protons and neutrons in the nucleus of an atom.
- 3The mass of a mole.
- 41/12th the mass of a Carbon-12 atom.
Correct answer
The number of protons in the nucleus of an atom of that element.
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