An element belongs to 3^(rd) period and ...

An element belongs to `3^(rd)` period and group 17 of the modern periodic table, find out:
(a) The number of valence electrons and valency
(b) Lewis structure of its compound with hydrogen
(c) Electronic configuration of this element

Verified by Experts

(a) No. of valence electrons - seven (7), Valency - 1
(b) Formula with hydrogen - HCl

(c) 2, 8, 7

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