Question

An element has an electronic configuration 2,8,7.
i)To which group and period does it belong? ii)State its atomic number and valency
iii)Is it metallic or non metallic?Why?
iv)Identify the element and give the chemical formula of its compound formed.

Answer 1

1.Element is chlorine group is 17
2. Atomic no is 17 and valency -1
3.it is non metallic
4. chemical formula is cl-
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