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Ionic compounds
Foundation
2 marks
What is the formula of magnesium oxide? Explain how it forms.
A
MgO — Mg loses 2 electrons (Mg²⁺); O gains 2 electrons (O²⁻); charges balance in 1:1 ratio
B
MgO₂ — Mg loses 1 electron; O gains 1 electron each
C
Mg₂O — two Mg atoms for each oxygen
D
Mg₂O₂ — Mg forms +2 and O forms −1 ions
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