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2 Which particles have approximately the same mass?
(1) an electron and an alpha particle
(2) an electron and a proton
(3) a neutron and an alpha particle
(4) a neutron and a proton
An electron has a relative mass of 0, whilst an alpha particle has a relative mass of 4 An electron has a relative mass of 0, whilst a proton has a relative mass of 1 A neutron has a relative mass of 1, whilst an alpha particle has a relative mass of 4 A neutron has a relative mass of 1, and a proton also has a relative mass of 1
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