Question

how many electrons are in the outermost energy level of a chloride ion (Cl) in table salt.

Answer 1

8 electrons

Chlorine (atomic number 17) is in the third row of the Periodic Table. We see that it has 7 electrons in its outermost energy level. It needs only one more electron to give it an octet of electrons and a noble gas configuration. Hence, a chloride ion has 8 electrons in its outermost energy level.

Answer 2

8 electrons................