## BeO, beryllium oxide

 BE1 = O2
Tell me about the atomic charges, dipole moment, bond lengths, angles, bond orders,
molecular orbital energies, or total energy.
Tell me about the best Lewis structure.

## Atomic Charges and Dipole Moment

BE1 charge= 0.849
O2 charge=-0.849
with a dipole moment of 5.89380 Debye

## Bond Lengths:

between BE1 and O2: distance=1.443 ang___

## Bond Orders (Mulliken):

between BE1 and O2: order=1.971___

## Best Lewis Structure

The Lewis structure that is closest to your structure is determined. The hybridization of the atoms in this idealized Lewis structure is given in the table below.

### Hybridization in the Best Lewis Structure

1. A bonding orbital for Be1-O2 with 2.0000 electrons
__has 8.03% Be 1 character in a sp0.26 hybrid
__has 91.97% O 2 character in a s0.55 p3 hybrid

4. A lone pair orbital for O2 with 1.9990 electrons

5. A lone pair orbital for O2 with 1.9020 electrons
__made from a p-pi orbital ( 99.92% p 0.08% d)

6. A lone pair orbital for O2 with 1.9020 electrons
__made from a p-pi orbital ( 99.92% p 0.08% d)

-With core pairs on:Be 1 O 2 -

## Molecular Orbital Energies

The orbital energies are given in eV, where 1 eV=96.49 kJ/mol. Orbitals with very low energy are core 1s orbitals. More antibonding orbitals than you might expect are sometimes listed, because d orbitals are always included for heavy atoms and p orbitals are included for H atoms. Up spins are shown with a ^ and down spins are shown as v.

10 ----- 2.844

9 ----- 0.587 8 ----- 0.586

7 ----- -4.990

6 -^-v- -5.872 5 -^-v- -5.873

4 -^-v- -7.434

3 -^-v- -20.66

2 -^-v- -107.0

1 -^-v- -504.8

## Total Electronic Energy

The total electronic energy is a very large number, so by convention the units are given in atomic units, that is Hartrees (H). One Hartree is 2625.5 kJ/mol. The energy reference is for totally dissociated atoms. In other words, the reference state is a gas consisting of nuclei and electrons all at infinite distance from each other. The electronic energy includes all electric interactions and the kinetic energy of the electrons. This energy does not include translation, rotation, or vibration of the the molecule.

Total electronic energy = -89.8669454414 Hartrees