Chemistry · May / June 2025 · Paper 41 · Question 2
0620
As printed in the paper
The question as text
Atoms are made of electrons, neutrons and protons.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
2(a)[2]
M1
M2
charge
mass(1)
(1)
–1
1
+1
1
1 mark for each correct column
2(b)(i)[3]
electron
neutron
proton
19
20
19
18
22
19
1 mark for each correct column
2(b)(ii)[2]
M1 (41 × 10) + (39 × 90) = 3920 (1)
M2 (3920 ÷ 100) = 39.2(1)
2(b)(iii)[1]
aluminium has only 1 isotope which has nucleon number 27
2(c)[2]
M1 Ar (1)
M2 P3– or S2– or Cl – (1)
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