In the oxoanions of the heavier p-block elements, the central atom often has an expanded valence shell.

Name: In the oxoanions of the heavier p-block elements, the central atom often has an expanded valence shell.
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This is because the central atom in these oxoanions has access to the empty d orbitals in the valence shell, allowing it to accommodate additional lone pairs and bond with more oxygen atoms. This phenomenon is known as "hypervalency" or "expanded octet." Examples include SO4, ClO4, and BrO4.

In the Oxoanions of the Heavier P-Block Elements, the Central