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neon

(Encyclopedia) neonneonnēˈŏn [key] [Gr.,=new], gaseous chemical element; symbol Ne; at. no. 10; at. wt. 20.1797; m.p. −248.67℃; b.p. −246.048℃; density 0.8999 grams per liter at STP; valence 0. Neon…

neptunium

(Encyclopedia) neptuniumneptuniumnĕpt&oomacr;ˈnēəm [key], radioactive chemical element; symbol Np; at. no. 93; mass number of most stable isotope 237; m.p. about 640℃; b.p. 3,902℃ (estimated); sp…

(Encyclopedia) tantalumtantalumtănˈtələm [key] [from Tantalus], metallic chemical element; symbol Ta; at. no. 73; at. wt. 180.94788; m.p. 2,996℃; b.p. 5,400±100℃; sp. gr. 16.65 at 20℃; valence +2, +3…

cadmium

(Encyclopedia) cadmiumcadmiumkădˈmēəm [key] [from cadmia, Lat. for calamine, with which cadmium is found associated], metallic chemical element; symbol Cd; at. no. 48; at. wt. 112.411; m.p. 321℃; b.p…

bismuth

(Encyclopedia) bismuthbismuthbĭzˈməth [key] [Ger. Weisse Masse=white mass], metallic chemical element; symbol Bi; at. no. 83; at. wt. 208.98040; m.p. 271.3℃; b.p. about 1,560℃; sp. gr. 9.75 at 20℃;…

Rulers of Spain since 1474 (table)

(Encyclopedia) Rulers of Spain since 1474(including dates of reign) Union of Castile and Aragón Isabella I (of Castile), ruled jointly with Ferdinand II (of Aragón), 1474–1504 Ferdinand II,…

Economy 101

The vocabulary of recession Related Links Currency Quiz A Brief History of U.S. Banking Budgets What Is the Stock Market? Nobel Prize for Economics…

Confederate Flag Controversy

by Borgna Brunner The "Southern Cross" The Confederate battle flag, called the "Southern Cross" or the cross of St. Andrew, has been described variously as a proud emblem of…

DK Science: Moon

THE MOON IN ECLIPSETHE LUNAR SURFACEPHASES OF THE MOONFIND OUT MORECircling round Earth once a month, the Moon is our planet’s only natural satellite. As the Moon orbits Earth, our view of…

Physics

What is Physics? Matter and Materials Science Projects Encyclopedia: Chemistry Glossary of Chemistry Terms Virtual Lab Interactive Periodic Table…