Any individual atom has an oxidation number of 0.
Beryllium
As with any other element, the oxidation number of Cr depends on whether and how it is chemically bonded. The oxidation number of pure elements is arbitrarily defined to be 0. In compounds, Cr has oxidation numbers of +2, +3, and +6, depending on the compound.
Helium does not form any known stable compounds, and thus it is nearly always in the 0 oxidation state.
Most common is -1. But halogens (except fluorine) are known to exhibit oxidation numbers upto +7 in their compounds.
Positive oxidation numbers are most common with the metals - groups 1 to 13. However there are many well known compounds where non-metals have positive oxidation numbers- for example NaClO4 where Cl has an oxidation number of +7
In VO vanadium has an oxidation number of +2 and O an oxidation number of -2 Just in case you missed the 2+ , in vanadyl ion VO2+ V has the oxidation number of +4, O has -2
As with any other element, the oxidation number of Cr depends on whether and how it is chemically bonded. The oxidation number of pure elements is arbitrarily defined to be 0. In compounds, Cr has oxidation numbers of +2, +3, and +6, depending on the compound.
Helium does not form any known stable compounds, and thus it is nearly always in the 0 oxidation state.
Most common is -1. But halogens (except fluorine) are known to exhibit oxidation numbers upto +7 in their compounds.
Positive oxidation numbers are most common with the metals - groups 1 to 13. However there are many well known compounds where non-metals have positive oxidation numbers- for example NaClO4 where Cl has an oxidation number of +7
In VO vanadium has an oxidation number of +2 and O an oxidation number of -2 Just in case you missed the 2+ , in vanadyl ion VO2+ V has the oxidation number of +4, O has -2
It is determined from known oxidation states of other elements.
It is determined from known oxidation states of other elements.
I would expect Carbon to be the element that forms more compounds than any other element.
There is no known "sulfur metal". Sulfur is a nonmetal element, but in compounds with more electronegative nonmetals, such as oxygen, fluorine, and chlorine, sulfur can have a positive oxidation state.
Carbon
The element known as cobalt is present in many compounds.
If it existed, it would be called neon pentaoxide or Ne(X) oxide and neon would have the highest oxidation number known to science!There are no known compounds of neon- it has a full outer shell.