Answer:
(i)
The number of electrons gained, lost or shared to make the octet of electrons
(in the outermost shell), gives us directly the combining capacity of the
element, that is, the valency.
(ii)
Elements
Atomic no.
Electronic configuration
Valency
Chlorine
17
2,8,7
-1
Sulphur
16
2,8,6
-2
Aluminium
13
2,8,3
+3
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