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isomorphism

(Encyclopedia)isomorphism īˌsəmôrˈfĭzəm [key], of minerals, similarity of crystal structure between two or more distinct substances. Sodium nitrate and calcium sulfate are isomorphous, as are the sulfates of...

atomic weight

(Encyclopedia)atomic weight, mean (weighted average) of the masses of all the naturally occurring isotopes of a chemical element, as contrasted with atomic mass, which is the mass of any individual isotope. Althoug...

silicon

(Encyclopedia)silicon, nonmetallic chemical element; symbol Si; at. no. 14; interval in which at. wt. ranges 28.084–28.086; m.p. 1,410℃; b.p. 2,355℃; sp. gr. 2.33 at 25℃; valence usually +4. Silicon is the ...

Boyron, Michel

(Encyclopedia)Boyron, Michel: see Baron, Michel.

Uppsala, University of

(Encyclopedia)Uppsala, University of, at Uppsala, Sweden; founded 1477 by Sten Sture, the Elder, and Archbishop Jakob Ulvsson. Its activities were suspended in 1510 as a result of religious disputes. It was reorgan...

Vrangel, Baron Ferdinand Petrovich von

(Encyclopedia)Vrangel, Baron Ferdinand Petrovich von: see Wrangel, Baron Ferdinand Petrovich von. ...

Wrangell, Baron Ferdinand Petrovich von

(Encyclopedia)Wrangell, Baron Ferdinand Petrovich von: see Wrangel, Baron Ferdinand Petrovich von. ...

Elphinstone, Arthur, 6th Baron Balmerino

(Encyclopedia)Elphinstone, Arthur, 6th Baron Balmerino: see Balmerino, Arthur Elphinstone, 6th Baron. ...

Ashburton, John Dunning, 1st Baron

(Encyclopedia)Ashburton, John Dunning, 1st Baron: see Dunning, John, 1st Baron Ashburton. ...

thorium

(Encyclopedia)thorium thôrˈēəm [key] [from Thor], radioactive chemical element; symbol Th; at. no. 90; mass number of most stable isotope 232; m.p. about 1,750℃; b.p. about 4,790℃; sp. gr. 11.7 at 20℃; va...