WEEK 5 Flashcards
What are homonuclear bonds?
Bonds formed between atoms of the same element
What are heteronuclear bonds?
Bonds formed between different atoms
Can molecules be made up of heteronuclear and homonuclear bonds?
Yes
What is molecular orbital theory?
The molecular bond theory considers the formation on molecular orbitals from the overlap of atomic orbitals on all of the individual atoms in a molecule
Why is the molecular orbital theory useful?
It helps predict whether or not a molecule will exist given the constituent atoms electron configuration, the strength of covalent bonds and magnetic properties of molecules
What is an in phase overlap?
An in phase overlap is constructive. It results in the formation of a molecular orbital with a large amplitude and therefor high electron density between nuclei
What is an out of phase overlap?
It is destructive and gives a molecular orbital with zero amplitude and therefor zero electron density between nuclei
What occurs when electron density between two nuclei is maximised?
Internucelar charges are minimised
What does constructive overlap give?
A bonding molecular orbital
What does a destructive overlap give?
An anti bonding molecular orbital in which electron density in minimised between the nuclei and is zero at the node between the nuclei.
What do molecular orbital diagrams demonstrate?
The relative energies of an atomic orbitals and the molecular orbitals they form
What is the formula for bond order?
Bond order= 1/2(number of bonding electrons - number of anti-bonding electrons)
What is a diamagnetic molecule?
Molecules that have all occupied molecular orbitals paired up therefor won’t exhibit magnetic properties
What is a paramagnetic molecule?
Molecules that have partially filled molecular orbitals. Therefor will exhibit magnetic properties
What does bond order measure?
How strongly two nuclei interact
