(a) Write down the electronic configuration of (i) magnesium atom, and (ii) magnesium ion.
(At. No. of Mg = 12)
(b) Write down the electronic configuration of (i) sulphur atom, and (ii) sulphide ion.
(At. No. of S = 16)

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Solution

(a) (i) The electronic configuration of a magnesium atom (atomic no. 12) is: K L M
2 8 2
(ii) The electronic configuration of a magnesium ion (atomic no. 10) is: K L
2 8
(b) (i) The electronic configuration of a sulphur atom (atomic no. 16) is: K L M
2 8 6
(ii) The electronic configuration of a sulphide ion (atomic no. 18) is: K L M
2 8 8

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