It means metals that are highly reactive. It's one of the most self-evident pieces of terminology in all of chemistry.
Perhaps you were trying to ask which metals are considered "highly reactive", which is a separate question, and one that to some extent depends on your definitions, but would certainly at minimum include all the alkali metals, maybe the alkaline earth metals, and possibly a few selected others (aluminium, for example... we don't usually think of aluminium as "highly reactive" because it immediately forms a thin transparent protective layer of aluminium oxide when exposed to air, but without that layer, it is indeed pretty reactive).
The most reactive element replaces less reactive element in an equation and this is called reactivity series of metals.
Electronegativities of metals are very different: alkali metals are very reactive, platinum metals very unreactive. Metals react with nonmetals.
Noble metals have a low reactivity.
Noble metals have a low chemical reactivity.
Reactivity is a chemical property (in chemistry !).
Reactivity is a chemical property.
No. Reactivity to vinegar is an example of a chemical property.
Noble metals have a low reactivity.
Noble metals have a low chemical reactivity.
Reactivity is an example of a chemical property.
The reactivity of metals is used to transfer electricity without much electrical loss.
Reactivity is a chemical property (in chemistry !).
Reactivity is the chemical property.
Reactivity is a chemical property.
Tantalum, platinum and gold are very stable metals and have low reactivity.
No. Reactivity to vinegar is an example of a chemical property.
Down the group, reactivity decreases for non metals. It increases for metals.
The reactivity series of metals is a table listing metals from the most reactive to the least reactive.
Reactivity is not a change; it is a chemical property.