Two p-block elements X and Y form fluroides of the type EF₃$EF_{3}$. The fluoride compound XF₃$XF_{3}$ is a Lewis acid and YF₃$YF_{3}$ is a Lewis base. The hybridization of the central atoms of XF₃$XF_{3}$ and YF₃$YF_{3}$ respectively are

Core Logic

XF₃$XF_3$ acts as a Lewis acid, meaning it is an electron-deficient species capable of accepting an electron pair. A common example from the p-block is BF₃$BF_3$. The central Boron atom has 3 bond pairs and 0 lone pairs. Therefore, its steric number is 3, corresponding to sp²$sp^2$ hybridization.

YF₃$YF_3$ acts as a Lewis base, meaning it has an available lone pair to donate. A common example is NF₃$NF_3$. The central Nitrogen atom has 3 bond pairs and 1 lone pair. Its steric number is 4, corresponding to sp³$sp^3$ hybridization.

Step 1: Final Conclusion

The hybridization of X and Y respectively are sp²$sp^2$ and sp³$sp^3$.

Pattern Recognition

Electron deficient central atoms (Group 13) form sp²$sp^2$ planar molecules. Atoms with a lone pair (Group 15) form sp³$sp^3$ pyramidal molecules.

Chapter Mix

Class 11 Chemistry: Chemical Bonding and Molecular Structure Class 11 Chemistry: p-Block Elements