Question

atomic number of an element X is 17 to which group and period to the modern periodic table 10 x belongs is valency justify your answer​

Answer 1

2 8 7

the element belongs to 17 th group and 3 rd period

Answer 2

$\huge\underline{\blue{ANSWER}}$

X= 17

This shows element is Cl( Chlorine)

It belongs to halogens i.e, group 17 and period 3.

Valency is 2,8,7

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