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neptunium
Science; General science
A chemical element, symbol Np, atomic number 93. Neptunium is a member of the actinide or 5 f series of elements. It was synthesized as the first transuranium element in 1940 by ...
rubidium
Science; General science
A chemical element, symbol Rb, atomic number 37, and atomic weight 85.47. Rubidium is an alkali metal in group 1 of the periodic table. It is a light, low-melting, reactive ...
rutherfordium
Science; General science
A chemical element, symbol Rf, atomic number 104. Rutherfordium is the first element beyond the actinide series, and the twelfth transuranium element. In 1964 G. N. Flerov and ...
rhodium
Science; General science
A chemical element, symbol Rh, atomic number 45, relative atomic weight 102.905. Rhodium is a transition metal and one of the group of platinum metals (ruthenium, osmium, ...
radon
Science; General science
A chemical element, symbol Rn, atomic number 86. Radon is produced as a gaseous emanation from the radioactive decay of radium. The element is highly radioactive and decays by ...
ruthenium
Science; General science
A chemical element, symbol Ru, atomic number 44. The element is a brittle gray-white metal of low natural abundance, usually found alloyed with other platinum metals in nature. ...
scandium
Science; General science
A chemical element, symbol Sc, atomic number 21, atomic weight 44.9559. The only naturally occurring isotope is 45 Sc. The electronic configuration of the ground-state, gaseous ...
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