The most common oxidation numbers of fermium, Fm, are +2 and +3, though there are no stable isotopes (half-life times shorter than 100 days)
It shows some oxidation numbers. Generally it shows +4 oxidation numbers.
The fermium oxide is not known; the possible formula is Fm2O3.
0 in the elemental form, +2 and +4 in its compounds
Argon is very unreactive as it is a noble gas. Its common oxidation number is zero.
See the list of fermium isotopes at the link below.
It is a gas. Generally it shows -2 oxidation number.
-1 is most common in chlorides. However chlorine can exhibit oxidation numbers up to +7 in its compounds.
-1 in bromide (most common). It can exhibit oxidation numbers from -1 to +7 (in HBrO4)
Argon doesn't form compounds and so its oxidation number is zero
Bromine has an oxidation number of negative one, except when with oxygen or flourine.
It depends on the compound. Lead can have an oxidation state of either 2+ or 4+
Formulas for compounds