Tellurium — Tel*lu ri*um, n. [NL., from L. tellus, uris, the earth.] (Chem.) A rare nonmetallic element, analogous to sulphur and selenium, occasionally found native as a substance of a silver white metallic luster, but usually combined with metals, as with… … The Collaborative International Dictionary of English
black tellurium — Tellurium Tel*lu ri*um, n. [NL., from L. tellus, uris, the earth.] (Chem.) A rare nonmetallic element, analogous to sulphur and selenium, occasionally found native as a substance of a silver white metallic luster, but usually combined with metals … The Collaborative International Dictionary of English
Graphic tellurium — Tellurium Tel*lu ri*um, n. [NL., from L. tellus, uris, the earth.] (Chem.) A rare nonmetallic element, analogous to sulphur and selenium, occasionally found native as a substance of a silver white metallic luster, but usually combined with metals … The Collaborative International Dictionary of English
Metalloid — 13 14 15 16 17 2 B Boron … Wikipedia
heterocyclic compound — Any of a class of organic compounds whose molecules contain one or more rings of atoms with at least one atom (the heteroatom) being an element other than carbon, most frequently oxygen, nitrogen, or sulfur. As in regular cyclic hydrocarbons,… … Universalium
Cobalt — This article is about the metal. For other uses, see Cobalt (disambiguation). iron ← cobalt → nickel ↑ Co ↓ Rh … Wikipedia
Electron shell — Periodic table with electron shells An electron shell may be thought of as an orbit followed by electrons around an atom s nucleus. The closest shell to the nucleus is called the 1 shell (also called K shell ), followed by the 2 shell (or L shell … Wikipedia
boron group element — ▪ chemical elements Introduction any of the five chemical elements constituting Group 13 (IIIa) of the periodic (periodic law) table (see Figure >). The elements are boron (B), aluminum (Al), gallium (Ga), indium (In), an … Universalium
