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why clf3 does not follow octet rule

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The 'octet' rule is based upon available ns and np orbitals for valence electrons (2 electrons in the s orbitals, and 6 in the p orbitals). Beginning with the n=3 principle quantum number, the d orbitals become available (l=2).

Hence, the third-period elements occasionally exceed the octet rule by using their empty d orbitals to accommodate additional electrons. 

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