Question

give an element 'x' with atomic number 17 identify the element .give its valancy to which group and period it belongs?

Answer 1

Period is identified by counting the number of shells
Whereas group is identified by the number of valence electrons however from 3-8 you all 10 to the valence electrons to find the group.

Valencey:
no.of valence electrons= valencey ( only if the have valence electrons from 1-4)
8-no of valence electrons = valencey ( from elements having more than 5 or 5 as their valence electrons)

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Answer 2

Answer:

X is chlorine

Valency - 1

Group -17

Period -3

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Explanation: