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Russian and Soviet Rulers since 1462 (table)

(Encyclopedia) Russian and Soviet Rulers since 1462(including dates of rule) House of Rurik Ivan III (the Great), 1462–1505 Vasily III, 1505–33 Ivan IV (the Terrible), 1533–84 Feodor I, 1584…

DK Science: Atoms

FOOTBALL STADIUMNUCLEUSATOMIC NUMBERATOMIC MASSELECTRIC CHARGESBIOGRAPHY: NIELS BOHR Danish, 1885-1962FIND OUT MOREAn atom is the smallest part of an element that can exist on its own. Copper,…

The Chemistry of Biology: Atomic Theory

Atomic TheoryThe Chemistry of BiologyIntroductionAtomic TheoryChemical Reactions: Ionic, Covalent, and Polar Covalent BondsWaterOrganic ChemistryCarbohydratesLipidsProteinsNucleic AcidsVitamins and…

(Encyclopedia) hassiumhassiumhăsˈēəm, häsˈ– [key], artificially produced radioactive chemical element; symbol Hs; at. no. 108; mass number of most stable isotope 277; m.p., b.p., sp. gr., and valence…

gadolinium

(Encyclopedia) gadoliniumgadoliniumgădəlĭnˈēəm [key], metallic chemical element; symbol Gd; at. no. 64; at. wt. 157.25; m.p. 1,312℃; b.p. 3,233℃; sp. gr. 7.898 at 25℃; valence +3. Gadolinium is a…

gallium

(Encyclopedia) galliumgalliumgălˈēəm [key], metallic chemical element; symbol Ga; at. no. 31; at. wt. 69.723; m.p. 29.78℃; b.p. 2,403℃; sp. gr. 5.904 at 29.6℃ (solid), 6.095 at 29.8℃ (liquid);…

neodymium

(Encyclopedia) neodymiumneodymiumnēˌōdĭmˈēəm [key], metallic chemical element; symbol Nd; at. no. 60; at. wt. 144.242; m.p. about 1,021℃; b.p. about 3,068℃; sp. gr. 7.004 at 20℃; valence +3.…

palladium, chemical element

(Encyclopedia) palladium [Gr. Pallas, goddess of wisdom], metallic chemical element; symbol Pd; at. no. 46; at. wt. 106.42; m.p. 1,554℃; b.p. 2,970℃; sp. gr. 12.02 at 20℃; valence +2, +3, or +4.…

xenon

(Encyclopedia) xenonxenonzēˈnŏn [key] [Gr.,=strange], gaseous chemical element; symbol Xe; at. no. 54; at. wt. 131.293; m.p. −111.9℃; b.p. −107.1℃; density 5.86 grams per liter at STP; valence…

californium

(Encyclopedia) californiumcaliforniumkălˈĭfôrˌnēəm [key] [from California], artificially produced, radioactive metallic chemical element; symbol Cf; at. no. 98; mass no. of most stable isotope 251; m…