All the metals are reactive but differences in reactivity of metals are important. Some less reactive metals are: platinum, rhodium, palladium, osmium, iridium, ruthenium, gold.
fluorine
No. Helium is a nonmetal but it is completely non-reactive.
Fluorine, chlorine, bromine
Halogens: fluorine, chlorine, bromine, iodine, astatine. Also carbon, oxygen and nitrogen are reactive.