How do you use electronegativity values to determine the one element that always has a negative oxidation number when it appears in any binary compound?
Well, which is the most electronegative element.........?
On most electronegativity scales, fluorine is the most electronegative element. What does electronegativity mean? It is conceived to be the ability of an atom involved in a chemical bond to polarize electron density towards itself.
So let's look at some simple compounds (or molecules) of fluorine: interhalogens,
As a curiosity that speaks to fluorine's oxidizing ability, and reactivity, some fluorine chemists I have met are missing eyes or fingers after a laboratory accident. Fluorine chemistry is to be approached with care.