Bonding Theories Flashcards
Bonding theory that can be used to predict the electron pair and molecular geometry
Valence bond theory
VBT considers the interaction of atomic orbitals on separate atoms as they are brought together to form a molecule
MOT is used for determining molecular structure in which electrons are treated as moving under the influence of the nuclei in the whole molecule
Bonds formed by head-on overlapping of stomic orbitals
Sigma bonds
Bonds formed by sideways overlapping of atomic orbitals
Pi bonds
Bonds formed by four-lobe sideways overlapping of dx2y2 or dxy atomic orbitals
Delta bond
The geometries in VBT are not rigid, as bond angles and bond length may be distorted according to the groups around the central atom
MOT approximates the positions of MO as linear combinations of atomic orbitals (LCAO)
The more an AO contributes to MO, the closer is the energy of the MO to the contributing AO.
In terms of increasing energy
Bonding<non-bonding<antibonding
Resulting MO are designated as sigma, pi, and delta according to their rotational symmetry about the bond region.
Resulting MO are designated as u (ungerade) and g (gerade) for centro symmetric orbitals, according to their inversion symmetry
Highest MO containing at least an electron in the ground stateis called ____
Highest Occupied MO (HOMO)
The MO immediately higher than HOMO is ____
Lowest Unoccupied MO (LUMO)
HOMO and LUMO plays important roles in the properties and chemical reactivity of the molecules, collectively known as ____
Frontier orbitals
Molecules with atleast one unpaired electron are PARAMAGNETIC, and they tend to be attracted to external magnetic field
Molecules with fully paired electrons are DIAMAGNETIC, they tend to be repelled by magnetic field
Permanent magnetism associated with nickel, cobalt, and iron.
Ferromagnetic
