Question

which element is most likely to form an ion with a negative 2 charge?
oxygen
nitrogen
beryllium
magnesium

Explanation:

Oxygen has 6 valence electrons and gains 2 electrons to achieve a stable octet, forming an ion with a - 2 charge. Nitrogen gains 3 electrons to form a - 3 ion. Beryllium and magnesium are metals and lose electrons to form positive - charged ions.

Answer:

Oxygen