ADJ.
atomic
ERBIUM + NOUN
element
noun
A chemical element (symbol Er) with atomic number 68: a silvery-white metal, in nature always found in combination with other elements.
A single atom of this element.
noun — a trivalent metallic element of the rare earth group
Erbium has been found in certain titanium minerals.
Erbium is element atomic number 68 on the periodic table.