Ionic bonding in magnesium oxide
2 marks · NormalWhat is the name and symbol for the negatively charged ion formed when oxygen gains electrons?
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Oxide ion, O^{2-}
Also accept: Oxygen ion, O2-, as an alternative name
Common mistakes: O-; Oxide atom
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Marking points
B1 · 1 mark · Gives the correct name: oxide ion
B2 · 1 mark · Gives the correct symbol: O^{2-}
Worked solution
The negatively charged ion formed when oxygen gains electrons is the oxide ion, symbol O^{2-}.