Question

18. Name:
(i) An alkali metal in period 3 and halogen in period 2.
(b) The noble gas with 3 shells.
(c) The non-metals present in period 2 and metals in period 3.
(d) The element of period 3 with valency 4.
(e) The element in period 3 which does not form oxide.
(f) The element of lower nuclear charge out of Be and Mg.​

Answer 1

(a) Na and F

(b) Argon

(c) C, N, O and F are non-metals present in period 2 while Na, Mg and Al are metals in period 3.

(d) Silicon

(e) Argon

(f) Mg

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