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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).
What else can I help you with?
Are iron and oxygen highly reactive elements?
Iron is reactive but not highly reactive, while oxygen is highly reactive. When iron reacts with oxygen, it forms rust. Oxygen is highly reactive because it readily forms bonds with other elements, making it important for various chemical reactions.
Is potassium highly reactive or not usually reactive?
Potassium is highly reactive, even explosive in some circumstances.
What element is highly malleable and almost non reactive?
Gold is highly malleable and almost non-reactive.
Why do you not find pure samples of highly reactive element in the ground?
Highly reactive elements easily react with other substances in the environment, forming compounds rather than existing in their pure form. This is why it is rare to find pure samples of highly reactive elements in the ground.
Is plutonium highly reactive are non reactive?
Plutonium is not highly reactive under normal conditions. It is a relatively stable element that does not react readily with air or water. However, it can be reactive in certain chemical reactions or when exposed to high-energy particles.
Is cerium highly reactive?
Cerium is reactive but not highly reactive.
What is a highly reactive metal?
the highly reactive metal is potassium
Is sodium chloride highly reactive?
Sodium chloride is not highly reactive.
Are iron and oxygen highly reactive elements?
Iron is reactive but not highly reactive, while oxygen is highly reactive. When iron reacts with oxygen, it forms rust. Oxygen is highly reactive because it readily forms bonds with other elements, making it important for various chemical reactions.
Is Tin Reactive or no?
Tin is highly reactive.
Argon is a highly reactive gas true or false?
No, argon is not a highly reactive gas. It is stable.
Is potassium highly reactive or not usually reactive?
Potassium is highly reactive, even explosive in some circumstances.
What element is highly malleable and almost non reactive?
Gold is highly malleable and almost non-reactive.
How reactive is sodium?
highly
Is titanium highly reactive?
No
Is xenon highly reactive?
No.
What is the reactivity of phosphorus?
phosphorous is a highly reactive nonmetal but fluorine is more reactive
