Question 59 of 108 in Atomic Structure

Counting the number of electrons in an atom

1 mark · Easy

State the number of electrons in a neutral atom of lithium, which has an atomic number of 3.

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3 (±0)

Common mistakes: Giving the mass number; Stating protons plus neutrons

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Marking points

A1 · 1 mark · Gives the correct number of electrons (3) for lithium.

Worked solution

A neutral atom has the same number of electrons as protons. The atomic number of lithium is 3, so it has 3 protons and therefore 3 electrons.

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