Atomic number and mass number

1 mark · Easy

State what information the mass number of an atom gives you.

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The total number of protons and neutrons in the atom

Also accept: number of protons and neutrons; total of protons and neutrons

Common mistakes: Just number of protons; just number of neutrons

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Marking points

B1 · 1 mark · States that the mass number is the total number of protons and neutrons in the atom

Worked solution

The mass number gives the total number of protons and neutrons in the atom.