What is the order of species that will have the strongest mass shift on a magnetic susceptibility balance knowing that O2 is Diamagnetic and F2 is Paramagnetic I am lost if it is not NOCOF2O2?

Answer 1

The more paramagnetic the species is, the larger the mass shift. So, since oxygen has two unpaired electrons in the molecular orbital diagram it will have the strongest mass shift on a magnetic susceptibility balance.

Answer 2

The order of species based on their magnetic susceptibility from strongest to weakest shift would be F2>N2>O2>CO. This is because F2 is paramagnetic, N2 and O2 are weakly diamagnetic, and CO is also weakly diamagnetic.