Americium is an artificial element; minutes traces of americium may exist in uranium ores.
Natural sources for americium doesn't exist.
Americium is an artificial element, a natural source doesn't exist.
Americium is an artificial element; natural americium exist only in infinitesimal traces in uranium ores.
Americium crystal has a hexagonal type crystalization.
The isotope Am-241 is artificial; infinitesimal quantities of natural americium may exist in uranium ores.
Americium is an artificial chemical element, man made !
Americium is oxydable in air.
Americium has no odor.
No. Americium is an actinide.
Americium is not combustible.
americium is not ductile.
Americium is an artificial element; americium don't exist in the nature.