1.

an element a has atomic no 17 (a) to which group and period does it belong (b) how many electrons are present in its outmost layer (c) what is its valency (d) is it metal or non metal. (question by natu)​

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Answer:

The ELEMENT is CHLORINE (Cl).

a) It belongs to the 17th group and the 3RD period.

b) 7 electrons are present in its outer-most shell.

c) Valency of Cl is 1.

d) It is a non-metal.



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