Atomic number and mass number
2 marks · HardState the relative mass and relative charge of a neutron, and explain how these properties compare to those of a proton.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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Relative mass = 1, relative charge = 0; both neutron and proton have mass 1, but the neutron is neutral while the proton is positive.
Also accept: Neutron: mass 1, charge 0. Proton: mass 1, charge +1. Comparison: both have the same mass, but only the proton is positively charged.; Neutron has no charge (0) but same mass as proton (1).
Common mistakes: Saying neutron and proton are both positive; Mixing up relative charges
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Marking points
B1 · 1 mark · States relative mass and charge for neutron (1, 0)
B2 · 1 mark · Compares correctly: neutron and proton have same mass, but neutron is neutral and proton is positive
Worked solution
Relative mass of a neutron = 1
Relative charge of a neutron = 0
Comparison: Neutron and proton have the same relative mass, but the neutron has no charge while the proton has a +1 charge.