Because they do not conduct electricity
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Sorry- above answer is DANGEROUSLY incorrect- ALL metals conduct electricity- gold and silver especially. However, non-reactive metals do not tarnish or rust- they stay pretty.
Group-17 are most reactive non-metals. They form halogens.
Hydrogen
Some are but the most reactive are also non-metals.
Halogens.
Most non-metals are not highly reactive or an completely inert. However, the Halogens in Group 17 are reactive with nearly every substance on the planet.
The most reactive non metals are Halogens which may combine most of the metals as well as non metals.
the most reactive (non-metals) group in the periodic table is GROUP 17+they are all reactive
the very non reactive elements are very valuable but they are platinium, gold and silver.
Gold and platinum are less reactive metals but not absolutely non-reactive.
Gold is a less reactive metal but not non-reactive; all metals are reactive.
Alkali metals are most reactive metals. Halogen family comprises of highly reactive non-metals.
Group-17 are most reactive non-metals. They form halogens.
Hydrogen
Non metals usually form covalent bonds with other non metals and ionic bonds with reactive metals.
The most reactive non-metals are the halogens, group 17.
Dead fish.
Some are but the most reactive are also non-metals.