For an element x, it is given that atomic number = 17 and mass number =35. Write the electronic configuration of the element x. Find its valency. Is it a metal;or non metal

Dear student, 
The electronic configuration:
Atomic no.  K L M
17 2 8 7
As the valence shell has 7 electrons
Therefore, valency = 8-7=1
The above element is a Non-metal because it has more than 3 electrons in it's valence shell. 
Regards
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Electronic configuration - (2,8,7)
Valency-1
It's a non metal
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