Cambridge O Level - GCE Guide
CHEMISTRY 5070/21 Paper 2 Theory May/June 2021 MARK SCHEME Maximum Mark: 75 Published This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the ... 2(d)(i) 86 protons / 86 electrons / same electronic structure 1 2(d)(ii) radon-222 has two more neutrons / radon-220 has two fewer neutrons / radon-220 ... ................
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