Number of hypervalent species among the following ClO−4,BF3,SO2−4,CO2−3

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Solution

A hypervalent molecule (expanded octet) is a molecule that contains one or more main group elements formally bearing more than eight electrons in their valence shells. So ClO⁻⁴is hypervalent as Cl contains more than 8 electrons and SO²⁻₄ is hypervalent as S contains more than 8 electrons. In BF₃, boron contains only 6 valence electrons in its outer shell. In CO²⁻₃, the C atom contains 8 electrons in its valence shell.

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