May/June 2026 Paper 13

2026 · 40 questions · 40 parts · 40 marks

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40Radioactive Decay Nuclear EquationsMedium1 mark
A nucleus X is plotted on a graph of neutron number N against proton number Z.
a graph of neutron number N (vertical axis, 140 to 145) against proton number Z (horizontal axis, 90 to 95), with a single point X plotted at Z = 94, N = 144
The nucleus undergoes -decay.
Which arrow shows the changes in N and Z?
graph A: an arrow starts at X (Z = 94, N = 144) and points down and slightly left, ending at about Z = 92, N = 140: a decrease of 2 in Z and a decrease of 4 in N
A
graph B: an arrow starts at X (Z = 94, N = 144) and points left and slightly down, ending at about Z = 90, N = 142: a decrease of 4 in Z and a decrease of 2 in N
B
graph C: an arrow starts at X (Z = 94, N = 144) and points down and to the left, ending at about Z = 92, N = 142: a decrease of 2 in both Z and N
C
graph D: an arrow starts at X (Z = 94, N = 144) and points down and to the right, ending at about Z = 95, N = 143: an increase of 1 in Z and a decrease of 1 in N
D