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hydrochloric acid

(Encyclopedia)hydrochloric acid: see hydrogen chloride. ...

cobalt bomb

(Encyclopedia)cobalt bomb: see hydrogen bomb. ...

neutron bomb

(Encyclopedia)neutron bomb: see hydrogen bomb. ...

prussic acid

(Encyclopedia)prussic acid: see hydrogen cyanide. ...

cyanide

(Encyclopedia)cyanide sīˈənīdˌ [key], chemical compound containing the cyano group, –CN. Cyanides are salts or esters of hydrogen cyanide (hydrocyanic acid, HCN) formed by replacing the hydrogen with a metal...

Bettelheim, Bruno

(Encyclopedia)Bettelheim, Bruno bĕtˈəlhīmˌ [key], 1903–90, American developmental psychologist, b. Austria. He received his doctoral degree (1938) from the Univ. of Vienna. He was imprisoned in the Dachau an...

hydrocarbon

(Encyclopedia)hydrocarbon hīˌdrōkärˈbən [key], any organic compound composed solely of the elements hydrogen and carbon. The hydrocarbons differ both in the total number of carbon and hydrogen atoms in their ...

molecular weight

(Encyclopedia)molecular weight, weight of a molecule of a substance expressed in atomic mass units (amu). The molecular weight may be calculated from the molecular formula of the substance; it is the sum of the ato...

fluorine

(Encyclopedia)fluorine flo͞oˈərēn, –rĭn [key], gaseous chemical element; symbol F; at. no. 9; at. wt. 18.9984; m.p. −219.6℃; b.p. −188.14℃; density 1.696 grams per liter at STP; valence −1. Fluorin...

valence, in chemistry

(Encyclopedia)valence, combining capacity of an atom expressed as the number of single bonds the atom can form or the number of electrons an element gives up or accepts when reacting to form a compound. Atoms are c...