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radon

(Encyclopedia) radonradonrāˈdŏn [key], gaseous radioactive chemical element; symbol Rn; at. no. 86; mass no. of most stable isotope 222; m.p. about −71℃; b.p. −61.8℃; density 9.73 grams per liter at…

proton

(Encyclopedia) proton, elementary particle having a single positive electrical charge and constituting the nucleus of the ordinary hydrogen atom. The positive charge of the nucleus of any atom is due…

The House of Representatives — 110th Congress

In the following lists, the numeral indicates the congressional district represented; AL is for representatives at large. All terms run from Jan. 2007 to Jan. 2009. See also: Current and…

Berenice, b. c.a.d. 28, Jewish princess

(Encyclopedia) Berenice, b. c.a.d. 28, Jewish princess; daughter of Herod Agrippa I (see under Herod). A very beautiful woman, she was often involved in intrigue. After her first husband died, she…