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