Atomic number and mass number

2 marks · Normal

Name the three types of sub-atomic particles in an atom and state where each is located.

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Proton – nucleus; Neutron – nucleus; Electron – outside nucleus/in shells/energy levels

Also accept: Protons and neutrons in nucleus, electrons outside nucleus/in shells

Common mistakes: Saying all are in the nucleus

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Marking points

B1 · 1 mark · Names all three sub-atomic particles correctly.

B2 · 1 mark · Correctly states the position of each (protons and neutrons in nucleus; electrons outside nucleus/in shells/energy levels).

Worked solution

The three sub-atomic particles are: - Proton – in the nucleus - Neutron – in the nucleus - Electron – outside the nucleus (in shells/energy levels)