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rutherfordium

(Encyclopedia)rutherfordium rŭᵺˌərfôrˈdēəm [key], artificially produced radioactive chemical element; symbol Rf; at. no. 104; mass number of most stable isotope 265; m.p., b.p., and sp. gr. unknown; valenc...

sand

(Encyclopedia)sand, rock material occurring in the form of loose, rounded or angular grains, varying in size from .06 mm to 2 mm in diameter, the particles being smaller than those of gravel and larger than those o...

semiconductor

(Encyclopedia)CE5 N-type and P-type crystals: In a pure silicon crystal each silicon atom (Si) is surrounded by four valence electrons. In the N-doped semiconductor, illustrated in the left-hand figure, some sil...

condensate

(Encyclopedia)condensate, matter in the form of a gas of atoms, molecules, or elementary particles that have been so chilled that their motion is virtually halted and as a consequence they lose their separate ident...

circus

(Encyclopedia)circus [Lat.,=ring, circle], historically, the arena associated with the horse and chariot races and athletic contests known in ancient Rome as the Circensian games. The Roman circus was a round or ov...

Zyuganov, Gennady Andreyevich

(Encyclopedia)Zyuganov, Gennady or Gennadi Andreyevich gĕnäˈdē əndrāˈyəvĭch zyo͞ogäˈnôf [key], 1944–, Russian politician, b. Mymrino. The son and grandson of country schoolteachers, he grew up in the...

gourd

(Encyclopedia)CE5 Wild balsam apple, Echinocystis Jobata, a member of the gourd family gourd gôrd, go͝ord [key], common name for some members of the Cucurbitaceae, a family of plants whose range includes all ...

trust

(Encyclopedia)trust, in law, arrangement whereby property legally owned by one person is administered for the benefit of another. Three parties are ordinarily needed for the relation to arise: the settlor, who bequ...

Priestley, Joseph

(Encyclopedia)Priestley, Joseph, 1733–1804, English theologian and scientist. He prepared for the Presbyterian ministry and served several churches in England as pastor but gradually rejected orthodox Calvinism a...

oganesson

(Encyclopedia)oganesson ōˈgənĕsˌən [key], artificially produced radioactive chemical element; symbol Og; at. no. 118; mass number of most stable isotope 294; m.p., b.p., sp. gr., and valence unknown. Situated...