Thorium
Americium is a member of the actinides group.
Curium is an artificial element, radioactive, unstable, metal , solid, a member of the actinides group.
Uranium is a member of the actinides (syn.: actinoids) family.
The name of the chemical element lawrencium is derived from the name of the physicist Ernest Lawrence.
Actinium is a member of the actinides family; actinium is a natural chemical element, metal, solid, extremely radioactive.
Einsteinium is an artificial chemical element, unstable, radioactive, member of the actinides group, atomic number 99.
Plutonium is a member of the actinides group.
Einsteinium is an artificial chemical element, unstable, radioactive, member of the actinides group, atomic number 99 - but it is not enigmatic.
Americium belongs to the actinide element family, which is a group of radioactive elements found in the actinide series of the periodic table. Actinides are characterized by their high atomic numbers and radioactivity. Members of this family include uranium, plutonium, and thorium.
Element groups
The lanthanides get their name from the element lanthanum, which was the first in the series to be discovered. The actinides get their name from actinium, which was the first element in this series to be discovered.
Plutonium is a member of the actinides group.