Physics · Oct / Nov 2021 · Paper 41 · Question 9
0625
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The question as text
Uranium‑235 (235 92U) is a radioactive isotope of uranium that occurs naturally on Earth.
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9(a)[4]
(very small) nucleus and surrounded by electrons (in orbit / shells)
92 protons or 92 electrons or number of protons = number of electrons
protons and neutrons in nucleus
143 neutrons
9(b)[1]
(uranium-238 has) three more neutrons (in nucleus)
9(c)[2]
(38)(E)
94
(94)
38(E)
9(d)(i)[1]
55
9(d)(ii)[1]
140
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