Because of transfer of electrons from the oxygen atom to the metal.
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B
Metal atom donates the loosely held outermost electrons to form positive metal ions.
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C
Because of transfer of electrons from the metal atom to the oxygen atoms.
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D
Both B and C
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Solution
The correct option is D Both B and C Metal ions are electrovalent in nature which are formed by the transfer of electrons from the metal atom to oxygen atoms. In the process of transfer of electrons. Metal becomes positively charged and oxygen becomes negatively charged.