Question

How does chlorine form an ion?
A. It gains one electron to form a Cl1- ion.
B. It gains one electron to form a Cl1+ ion.
C. It loses one electron to form a Cl1- ion.
D. It loses one electron to form a Cl1+ ion.

Answer 1

Ans : (A) option is correct one.

Because atomic no. of chlorine is 17
and
electronic configuration is 2,8,7

so, it want one more electron to complete octet.

therefore chlorine will gain one electron and form Cl-

Answer 2

option A is correct

because cl contains outer most shell is ( 3s2 , 3p5 ) ====> 7 electrons