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.
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)
It belongs to the Actinide family.
It is Uranium
The actinide series
Radon is not an actinide, it is a noble gas.
Plutonium is an actinide
No uranium is an actinide and is very hard especially depleted uranium
it is manmade
Manmade actually.
Manmade
Einsteinium is a trivalent actinide metal.
manmade
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