2 atoms that have very different electronegativities. Hence, option C is correct.
An ionic bond is formed by the complete transfer of some electrons from one atom to another.
Ionic bond, also called an electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound.
Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.
Hence, option C is correct.
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