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A metallic chemical element (symbol Dy) with an atomic number of 66.
The systematic element name for the (as yet undiscovered) chemical element with atomic number 116 (symbol Uuh).
a metallic chemical element (symbol Tl) with atomic number 81.
A soft, waxy, silvery reactive metal that is never found unbound in nature; an element (symbol K) with an atomic number of 19 and atomic weight of 39.0983. The symbol is derived from the Latin kalium.
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a heavy, gaseous chemical element (symbol Xe) of the noble gases group with an atomic number of 54.
a metallic chemical element (symbol Mo) with an atomic number of 42.
A metallic chemical element (symbol Cr) with an atomic number of 24.
A metallic chemical element (symbol Re) with an atomic number of 75.
a chemical element (symbol Po) with atomic number 84.