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Si, chemical symbol

(Encyclopedia)Si, symbol for the element silicon. ...

Po, chemical symbol

(Encyclopedia)Po, symbol for the element polonium. ...

Cd, chemical symbol

(Encyclopedia)Cd, symbol for the element cadmium. ...

Ra, chemical symbol

(Encyclopedia)Ra, symbol for the element radium. ...

Head, Sir Francis Bond

(Encyclopedia)Head, Sir Francis Bond, 1793–1875, British administrator in Canada. A soldier (1811–25) and unsuccessful mining adventurer in South America, he had had little experience to prepare him for the pos...

Bond, J. Max, Jr.

(Encyclopedia)Bond, J. Max, Jr., 1935-2009, African-American architect, b. Lexington, Ky., Harvard Univ. (BA, 1955; MA, 1958). Bond’s father, J. Max, Sr., was ...

fatty acid

(Encyclopedia)fatty acid, any of the organic carboxylic acids present in fats and oils as esters of glycerol. Molecular weights of fatty acids vary over a wide range. The carbon skeleton of any fatty acid is unbran...

molecular orbital theory

(Encyclopedia)molecular orbital theory, detailed explanation of how electrons are distributed in stable molecules. In the simpler valence theory of the chemical bond, each atom in a molecule is assumed to retain it...

macromolecule

(Encyclopedia)macromolecule, term that may refer either to a crystal such as a diamond, in which the atoms are identical and held by covalent bonds (see chemical bond) of equal strength, or to one of the units that...

carbonyl group

(Encyclopedia)carbonyl group kärˈbənĭl [key], in chemistry, functional group that consists of an oxygen atom joined by a double bond to a carbon atom. The carbon atom is joined to the remainder of the molecule ...