Is it possible for a single atom to exhibit both covalency and electrovalency?.Discuss with appropriate examples.

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Solution

Covalency: The number of electrons that an atom can share to get a stable electronic configuration.
Electrovalency: The number of electrons lost or gained by an atom to get a stable electronic configuration in forming an ionic bond.
It is possible for a single atom to exhibit both covalency and electrovalency. Chlorine is an example.
Chlorine forms electrovalent (ionic bonds) with metals like sodium, and potassium and obtains stability.Example:sodium chloride (NaCl)
Chlorine forms covalent bonds with non-metals. Monofluoride chlorine(ClF) is an example.
Thus chlorine can exhibit both electrovalency and covalency.

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