Answer :

The elements are neon (Ne), calcium (Ca), nitrogen (N) and silicon (Si)


(b) Group no.: neon (Ne) - 18, calcium (Ca) - 2, nitrogen (N) -15 and silicon (Si) - 14


(c) Period: neon (Ne) – 2nd period, calcium (Ca) – 4th period, nitrogen (N) - 2nd period and silicon (Si) – 3rd period


(d) Electron configuration: neon (Ne) - (2, 8), calcium (Ca) - (2, 8, 8, 2), nitrogen (N) - (2, 5) and silicon (Si) - (2, 8, 4)
(e) Valency: neon (Ne) - 0, calcium (Ca) - 2, nitrogen (N) - 3 and silicon (Si) - 4

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