Argon doesn't form compounds and so its oxidation number is zero
Argon is very unreactive as it is a noble gas. Its common oxidation number is zero.
It shows some oxidation numbers. Generally it shows +4 oxidation numbers.
Argon is generally considered to be unreactive element, i.e. it cannot form compounds. But new researchs have found that argon can form a compound called Argon fluorohydride(HArF) which is very unstable. Here Argon's charge may be neutral, i.e. 0
The oxidation number for argon is 0. All of the noble gases are inert.
0 in the elemental form, +2 and +4 in its compounds
It is always found in the oxidation state of 0
It is a gas. Generally it shows -2 oxidation number.
It is always found in the oxidation state of 0
-1 in bromide (most common). It can exhibit oxidation numbers from -1 to +7 (in HBrO4)
-1 is most common in chlorides. However chlorine can exhibit oxidation numbers up to +7 in its compounds.
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 is always found in the oxidation state of 0