Why are pentahalides more covalent than …
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Dr. Kamlapati Bhatt 8 years, 4 months ago
The extent of covalency is usually inferred by the polarising power / polarisation of bonds in a a covalent compound. The polarising power in a covalent compound depends upon the charge or oxidation state of the central atom .The atoms of Group 15 elements ( except N ) form both tri and pentahalides . These atoms are , therefore , termed as central atom , and have have large polarising power than the halogen atom attached to them . Thus, higher the oxidation state of central atom more is the polarising power. Accordingly,
, in pentahalides the oxidation state of central atom is +5 , while in trihalide it is +3 . Therefore , pentahalides are more covalent than a trihalide.
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