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Saxe-Coburg

(Encyclopedia) Saxe-CoburgSaxe-Coburgsăks-kōbərg [key], Ger. Sachsen-Coburg, former duchy, central Germany. A possession of the Ernestine branch of the house of Wettin, it was given by Ernest the…

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…