CIE IGCSE Chemistry Solved Past Paper Oct/Nov 2019 P41
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CIE IGCSE Chemistry Solved Past Paper Oct/Nov 2019 P41
CIE IGCSE Chemistry Solved Past Paper May/June 2019 P43
CIE IGCSE Chemistry Solved Past Paper May/June 2019 P42
1a) number of protons in the nucleus of an atom
b(i) 12 12 1 2
12 14 12
(ii) isotopes
(iii) because they have the same number of electrons in their outer shells
c) beryllium metal and chloride ion
d) 2,8,3