Radon is not an actinide, it is a noble gas.
An actinon is a radioactive isotope of an actinide, sometimes used exclusively for an isotope of radon.
Plutonium is an actinide
No uranium is an actinide and is very hard especially depleted uranium
Einsteinium is a trivalent actinide metal.
Actinide is not an element, but is a series of elements. Of the actinide series of elements, all except actinium, thorium, protactinium, and uranium are considered to be synthetic elements because they are not found in nature in appreciable amounts.
Ac
The actinide series.
Actinide
No. Americium is an actinide.
Th, element 90, spelled thorium, is an actinide and has been used as a nuclear fuel (see Wikipedia.)
There are no elements in Radon, Radon is an element in its own right.
as a consequence of actinide contraction the radius of the metal atom decreases as the 5f electrons of the actinides are poorly shielded. (Due to this poor shielding it is more strongly attracted by the nuclear charge resulting in decreased radius)