Draw The Most Appropriate Lewis Structure(S) For BeF2

2. Draw The Most Appropriate Lewis Structure(S) For BeF2. What Is The Electron Domain Geometry And The Molecular Geometry? Does The Molecule Have A Dipole? What Is The Hybridization Of The Central Atom? How Many O And It Bonds Are There?

The Correct Answer and Explanation is :

Lewis Structure for BeF2

To draw the Lewis structure for beryllium fluoride (BeF₂), follow these steps:

1. Determine the total number of valence electrons:

• Beryllium (Be) has 2 valence electrons (group 2 element).
• Fluorine (F) has 7 valence electrons, and there are two fluorine atoms.
• Total electrons = 2 (from Be) + 7 × 2 (from F) = 16 electrons.

1. Place the central atom (Be) and surrounding atoms (F):

• Place Be in the center because it is less electronegative than F.
• Connect each F to Be with a single bond, which uses 4 electrons (2 electrons per bond).
• The remaining 12 electrons will be placed as lone pairs on the fluorine atoms.

1. Distribute the electrons:

• After bonding, 12 electrons remain. Assign these electrons as lone pairs to the fluorine atoms.
• Each fluorine will get three lone pairs, leaving each fluorine atom with a complete octet.

Thus, the Lewis structure for BeF₂ is:

   F-Be-F

With each F atom having 3 lone pairs.

Electron Domain Geometry and Molecular Geometry

• Electron Domain Geometry: Be has two bonds and no lone pairs around it, which gives an electron domain geometry of linear.
• Molecular Geometry: Since there are no lone pairs on the central atom (Be), the molecular geometry is also linear.

Dipole Moment

• Dipole Moment: The molecule does not have a dipole moment because BeF₂ is symmetric, with two fluorine atoms on opposite sides of the beryllium atom. The dipoles created by each Be-F bond cancel each other out, leading to no overall dipole moment.

Hybridization of the Central Atom

• Hybridization: The central atom Be has two bonding regions (two Be-F bonds). Therefore, the hybridization is sp.

O and I Bonds

• In BeF₂, the molecule consists of 2 single bonds between the beryllium and fluorine atoms (I-type bonds). There are no O bonds in this structure.

Summary

• Lewis Structure: Be-F-Be with lone pairs on fluorine.
• Electron Domain Geometry: Linear.
• Molecular Geometry: Linear.
• Dipole Moment: No dipole moment.
• Hybridization: sp.
• Bonds: 2 I-type (Be-F) bonds, no O bonds.