Science
The formation of magnesium oxide is correctly shown in option :
options
Metals & Non-Metals
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Answer
Reason — When magnesium reacts with oxygen each Mg atom loses its two valence electrons to form Mg2+ and an oxygen atom (which has six valence electrons) gains those two electrons to complete its octet and form O2-.
The correct electron-dot representation shows both valence electrons of Mg being transferred to oxygen, leaving Mg2+ (no valence dots) and the oxide ion O2- with eight electrons as shown below :
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options
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