Answer:
Atomic numbers of elements A, D, C, L, S are 3, 9, 11, 17, 19 respectively. (i) A, C, S and D, L are sets which have same chemical properties. (ii) Metals should lose electrons and hence should have 1or 2 or 3 electrons in the outermost shell. Therefore A, C, S are metals. (iii) Non-metals should gain electrons and hence should have 5 or 6 or 7 electrons in the outermost shell. D, L are non-metals. (iv) Valency of C = 1 and L is also 1 (8 - 7 = 1) Therefore the formula is CL. (v) \[{{D}_{2}}\]and\[{{L}_{2}}\]. Electronic Configuration Element Atomic number A 3 2,1 D 9 2,7 C 11 2,8,1 L 17 2,8,7 S 19 2,8,8,1
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