Question

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

Answer 1

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