Question

An element X has atomic number 17, find its valency and electronic configuration.

Answer 1

element X is chlorine .
valency .....or the combining capacity is 1.
electronic configuration...2,8,7.
hope this helps

Answer 2

Hola there,

Atomic no. of element = 17

Electronic configuration = 2, 8, 7

Valence electron = 7

Valency = 8 - valence electron

= 8 - 7

= 1

Element X is Chlorine

Hope this helps...:)