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In SF₆, sulfur has 12 electrons around it (6 bonds), exceeding the octet, possible due to 3d orbitals. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.
In AsF₅ , arsenic uses one s, three p, and one d orbital to form five sp³d hybrid orbitals, giving a trigonal bipyramidal shape.
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Valence Bond Theory and Hybridisation - sp sp2 sp3 dsp2
In PCl₅ , phosphorus has 5 bonds (10 electrons), exceeding the octet due to d-orbital availability.
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
In BrF₅ , bromine has 5 bonds (10 electrons) and 1 lone pair (2 electrons), totaling 12 electrons, exceeding the octet via d-orbital use.
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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