Yes they are but less than Actinoids.
Hydrogen IS reactive
fluorine is the most reactive
Manganese is not particularly reactive. This is strange considering it is more electropositive than its neighbors in the periodic table.
Bromine (Br2) is the third most reactive halogen.
Most reactive metals are alkali metals, most reactive nonmetalas are halogens.Least reactive metals are platinum metals; least reactive nonmetals are noble gases.
Yes, promethium, which is a lanthanide, has no stable isotopes.
I dunnu, I googled the same thing. This guys notes says "A group of elements in the first row of the rare earth elementsin the periodic table"
It is as reactive as indium. Just kidding, it is reactive. Hoe reactive, more reactive than silver, but not as reactive as tin.
reactive
Cerium is reactive but not highly reactive.
helium is non reactive.
Hydrogen IS reactive
reactive.
it is reactive
fluorine is the most reactive
Manganese is not very reactive; the electronegativity is 1,55.
Reactive