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#lone pairs

12 public questions tagged with this topic.

The number of lone pairs on the central atom in XeF₂ is:

In XeF₂ , xenon has 8 valence electrons and forms 2 bonds (4 electrons used), leaving 4 electrons as 3 lone pairs. With sp³d hybridization, the 5 electron pairs (2 bonding, 3 lone) result in a trigonal bipyramidal electron geometry and a linear molecular shape.

Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Valence Bond Theory and Hybridisation - sp sp2 sp3 dsp2

Which molecule has a bond angle of approximately 98° due to two lone pairs on the central atom?

In SF₂ , sulfur is sp³ hybridized with 4 electron pairs (2 bonding, 2 lone), forming a bent shape. The F-S-F bond angle is ~98°, reduced from 104.5° in H₂O due to increased lone pair repulsion from electronegative fluorine atoms.

Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Covalent Bonding - Bond Parameters and Polarity and Fajan's Rule