Physics · Oct / Nov 2021 · Paper 42 · Question 11
0625
As printed in the paper
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11(a)[4]
(very small) nucleus AND (surrounded by) electrons (in orbit / shells)
neutrons and protons in nucleus
4 electrons (in atom) OR number of electrons = number of protons
4 neutrons (in nucleus)
11(b)[4]
135
55 on left
Cs on left
135Ba
on right
56
+β on right OR –β on left
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