Question

SeF6 1. Lewis Structure 2. Perspective drawing 3. Number of atoms bonded to central atom 4. Number of non-bonding electron pairs on the central atom 5. Electronic geometry: 6. Molecular geometry with ideal bond angles 7. Hybridization of central atom 8. Polarity:

Answer 1

The answer is- $SF_{6}$ is octahedral in electronic and molecular geometry with 6 Fluorine atoms bonded to central atom S.

Lewis structures are the diagrams in which the valence electrons of the atoms of a compound are arranged around the atoms showing the bonding between the atom and the lone pair of electrons existing in the molecule.

Determine the molecular geometry of $SF_{6}$.

• Valence Shell Electron Pair Repulsion theory is commonly known as VSEPR theory and it helps to predict the geometry of molecules.
• According to this theory, electrons are arranged around the central atom of the molecule in such a way that there is minimum electrostatic repulsion between these electrons.
• Now, calculate the total number of valence electrons in $SF_{6}$.

$Valence\ electrons\ in\ SF_{6}= Valence\ electrons\ in\ S +\ 6(Valence\ electrons\ in\ F)$

Valence electrons of S = 6

Valence electrons of F = 7

Thus, the valence electrons in $SF_{6}$ are-

$Valence\ number\ of\ electrons\ in\ SF_{6} = (6) + 6(7) = 48\ electrons.$

• The Lewis structure of $SF_{6}$ is - (Image attached).
• In the structure, the number of atoms bonded to central atom (S) = 6.
• Number of non-bonding electron pairs on the central atom = 0 (as all the valence electrons are bonded to F).
• Electronic geometry in case of 6 bond pairs is octahedral.
• Molecular geometry us also octahedral with bond angles 90°.
• Central atom is sp3d2 hybridised.
• $SF_{6}$ is a non-polar molecule.

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