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selenium
Science; General science
A chemical element, symbol Se, atomic number 34, atomic weight 78.96, first isolated by J. J. Berzelius in 1817 from sulfur used in the Swedish sulfuric acid industry. The ...
seaborgium
Science; General science
A chemical element, symbol Sg, atomic number 106. Seaborgium has chemical properties similar to tungsten. It was synthesized and identified in 1974. This is the fourteenth of the ...
silicon
Science; General science
A chemical element, symbol Si, atomic number 14, and atomic weight 28.086. Silicon is the most abundant electropositive element in the Earth's crust. The element is a metalloid ...
samarium
Science; General science
A chemical element, symbol Sm, atomic number 62, belonging to the rare-earth group. Its atomic weight is 150.35, and the naturally occurring isotopes are 144 Sm (3.09%), 147 Sm ...
tin
Science; General science
A chemical element, symbol Sn, atomic number 50, atomic weight 118.69. Tin forms tin(II) or stannous (Sn 2+ ), and tin(IV) or stannic (Sn 4+ ) compounds, as well as complex salts ...
tantalum
Science; General science
A chemical element, symbol Ta, atomic number 73, and atomic weight 180.948. It is a member of the vanadium group of the periodic table and is in the 5 d transitional series. ...
uranium
Science; General science
A chemical element, symbol U, atomic number 92, atomic weight 238.03. The melting point is 1132°C (2070°F) and the boiling point is 3818°C (6904°F). Uranium is one of the actinide ...
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