Chemistry · Oct / Nov 2021 · Paper 42 · Question 3
0620
As printed in the paper
The question as text
Atoms contain protons, neutrons and electrons.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
3(a)[3]
1 mark for each correct row
Name
Relative mass
Relative charge
Proton
1
+1
Neutron
1
0
Electron
1 / 1840
–1
3(b)[5]
Particle
Number of
Number of
Number of
protons
neutrons
electrons
3216S
16
16
16
3919K+
19
20
18
7935Br–
35
44
36
M1 = row 1 (1) M2 = row 2 (1) M3 =Br (1)
M4 = 7935 (on left of any symbol) (1) M5 = charge (on any symbol) (1)
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