(a) The number of valence electron in their atoms
(b) The size of their atoms.
(c) The formula of their oxides and chlorides.
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Explanation:
AN ATOM'S VALENCE ELECTRON NUMBER IS EQUAL TO THE ATOM'S MAIN GROUP NUMBER
I.E, OXYGEN HAS 6 ELECTRONS IN GROUP SO IT HAS 6 VALENCE ELECTRON
THE SIZE OF AN ATON IS 10^-10 meters
the formula of oxides is O
like ferrous oxide FE(2)0
CHLORIDES ARE CL
like NaCl sodium chloride
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