What is the electronic configuration of a chloride ion (Cl-)?Group of answer choices2,8,8,12,8,82,82,8,7

The electronic configuration of a chloride ion (Cl-) is 2,8,8.

Here's the step by step explanation:

1. Chlorine (Cl) is in the 3rd period, Group 17 of the periodic table, which means it has 17 electrons in its neutral state.

2. The electron configuration of a neutral chlorine atom is 2,8,7. This means there are 2 electrons in the first energy level (K shell), 8 in the second (L shell), and 7 in the third (M shell).

3. Chlorine tends to gain 1 electron to achieve a stable electron configuration, similar to the noble gases. This is because the third energy level (M shell) wants to have 8 electrons to be stable, following the octet rule.

4. When chlorine gains 1 electron, it becomes a chloride ion (Cl-) with a charge of -1. This extra electron fills up the third energy level (M shell), making the electron configuration 2,8,8.

So, the correct answer is 2,8,8.