Thorium is a natural chemical element, a radioactive metal.
Lithium is a natural chemical element.
Xenon is a natural chemical element.
Boron is a natural chemical element.
Dubnium is an artificial chemical element.
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.
Thorium is a natural chemical element.
Thorium is a natural chemical element.
Thorium is a natural, radioactive, chemical element; chemically, thorium is homogeneous.
Thorium is not a radiation but a chemical element, metal, natural and radioactive.
it is a natural element
Cadmium is a natural chemical element.
Lithium is a natural chemical element.
Yes
it is not natural it is a synthetic element.
Thorium is a natural chemical element; chemical elements were formed by stellar nucleosynthesis at the beginning of the universe.
Aluminium is a natural chemical element.
Xenon is a natural chemical element.