What happens when a chlorine atom gains an electron in its outer energy shell? A. It becomes a negative ion.

B. It has a decrease in the number of neutrons.

C. It becomes a positive ion.

D. It has an increase in the number of protons.

A.

Explanation: When a chlorine atom gains an electron, its outermost principal energy level achieves an octet. In this case, the ion has the same outermost shell as the original atom, but now that shell has eight electrons in it.

A

Explanation:

When a element gain a electron it is nation as it is now negatively charged

Please dont copy and paste these things, took me a long time to decode.

1)A and C are correct.

2)No, the deffinitions  have opposite results.

Step-by-step explanation:

1) They want to narrow down to "per writer" and A and C were the only ones that ended with per writer. It's about the writers not the words.

2)Website A had 22 posts per writer and 2200 words per writer.

   Website B had 18.1818... posts per writer and 3090.9090... words per writer.

Their results can't be compared because A is bigger in one thing and B is bigger in another. ( A in posts per writer and B had more words per writer. ) , so they are opposite results.

Hope this helped! Remember to not just copy and paste and expect an answer! If this helped, just give me a rating, a thank you, and maybe a comment if help is needed on another question! Have a great day!