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boron
Science; General science
A chemical element, B, atomic number 5, atomic weight 10.811, in group 13 of the periodic table. It has three valence electrons and is nonmetallic in behavior. It is classified as ...
barium
Science; General science
A chemical element, Ba, with atomic number 56 and atomic weight of 137.34. Barium is eighteenth in abundance in the Earth's crust, where it is found to the extent of 0.04%, making ...
beryllium
Science; General science
A chemical element, Be, atomic number 4, with an atomic weight of 9.0122. Beryllium, a rare metal, is one of the lightest structural metals, having a density about one-third that ...
bromine
Science; General science
A chemical element, Br, atomic number 35, atomic weight 79.909, which normally exists as Br 2 , a dark-red, low-boiling but high-density liquid of intensely irritating odor. This ...
carbon
Science; General science
A chemical element, C, with an atomic number of 6 and an atomic weight of 12.01115. Carbon is unique in chemistry because it forms a vast number of compounds, larger than the sum ...
calcium
Science; General science
A chemical element, Ca, of atomic number 20, fifth among elements and third among metals in abundance in the Earth's crust, Calcium compounds make up 3.64% of the Earth's crust. ...
cerium
Science; General science
A chemical element, Ce, atomic number 58, atomic weight 140.12. It is the most abundant metallic element of the rare-earth group in the periodic table. The naturally occurring ...
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