Which of the following would form an anion? (2 points) al o ar k

O or Oxygen because it needs electrons to be stable causing it to be an anion with a 2- charge to have a complete shell while Aluminum would be an cation with a 3+ charge, Potassium or K with a 1+ charge, and Argon wouldn’t be an anion because it is a noble gas and is already stable and don’t need electrons due to a full shell.

Mgo2 is the oxidation state of manganese oxide

Yes i think so not 100 percent sure though