D. 8
You can predict it from it's name "Octet" means Eight. Atom must have that number of electron to have a stable structure!
Hope this helps!
The 2 represents that it is a double carbon bond
it looks like..
C-C = C-C
Hopefully this will help you my friend.
Jasmine have 20 fish because4 times 5 equals 20
An anion is a negatively charged ion. An element can become an anion if it takes an extra electron such that it has one more electron than protons.
Atoms would preferentially taken an extra electron so that it can have a full octet and be more stable.

are some of the few elements that would have a -1 charge.