State the method of determining the valency of an element if its atomic number is. (ii) Determine the valency of the following elements, the atomic numbers of which are given in parenthesis: Chlorine (17), Sulphur (16), Aluminium (13)



(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.


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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