Question

When an oxygen atom forms an ion, it gains two electrons. What is the electrical charge of the oxygen ion? A. +2 B. -1 C. -2 D. +1

Answer 1

let me correct you , You miss typed "2-" its actually "-2"

Answer 2

C. 2-

electrons have a negative charge, thus adding two electrons to an atom will give it a charge of 2 times -1 or -2