Cerium is reactive but not highly reactive.
cerium is reactive, if hit with a sharp object it will combust and release nitrogen and hydrogenated carbon. it is the most stable of the rare earth elements though
It is very reactive
It is reasonably reactive. It has been used as a drier for alkyd paints. In that form it was Cerium Octoate.
the highly reactive metal is potassium
Elements are more reactive as you go down the periodic table and to the left.
Sodium chloride is not highly reactive.
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.
Tin is highly reactive.
No, argon is not a highly reactive gas. It is stable.
Potassium is highly reactive, even explosive in some circumstances.
highly
No