pg 192-203 Flashcards
what order are the atomic orbitals left to right
atom A, molecule, atom B
what is the up axis on energy level diagram
energy
what two principles are applied when adding the electrons
the aufbau exclusion principle
the pauli principle
is the bonding or antibonding orbital lower in energy
bonding
how to find the bond order according molecular orbital theory
number of filled bonding orbitals - number of filled antibonding orbitals
how many does a half filled orbital contribute to the bond order
1/2
what bond order makes a molecule paramagnetic
1/2
what bond order makes a molecule diamagnetic
1
why can He2 not happen
the four electrons contributed would fill one bonding and one antibonding orbital giving a bond order of 0
what does overlap mean for molecular orbital theory
the degree of interaction between orbitals
why is the bond dissociation enthalpy for Li2 lower than for H2
because of the lesser degree of overlap of wavefunctions from the 2s orbitals compared with the 1s orbitals
what does in phase bonding of pz orbitals look like
like a quality street
what does antibonding between pz orbitals look like
like two hourglasses next to each other with a nodal plane in between
what does a pi orbital label mean
that it can rotate 180 degrees around the X-X orbital with a change of phase
what does in phase combination of px orbitals look like
two ovals above and below the nuclei
what does out of phase combination of px orbitals look like
like two ovals above and below the nuclei chopped in half
why is pi overlap less effective than sigma overlap
because the orbitals are not pointed at each other meaning the molecular orbitals stabilize and destabilize less than sigma orbitals in energy level diagrams
are the 1 pi bonding and antibonding orbitals higher or lower energy than the 3 sigma orbitals
they are in between the bonding and the antibonding orbital
why is O2 paramagnetic
because it has unpaired electrons in the 1 pi antibonding orbitals
where do the dotted lines from the 2p shells go
one from each bonding shell to the two atomic shells
define isoelectronic
two different types of atoms with the same number of valence electrons
