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In BCl₃ , boron has 6 electrons around it (3 bonds), less than an octet, due to having only 3 valence electrons.
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Kossel-Lewis Approach and Octet Rule and Lewis Structures
In SF₆ , sulfur has 12 electrons around it, exceeding the octet due to the availability of d orbitals.
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Kossel-Lewis Approach and Octet Rule and Lewis Structures
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