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lutetium
Science; General science
A chemical element, Lu, atomic number 71, atomic weight 174.97, a very rare metal and the heaviest member of the rare-earth group. The naturally occurring element is made up of ...
mendelevium
Science; General science
A chemical element, Md, atomic number 101, the twelfth member of the actinide series of elements. Mendelevium does not occur in nature; it was discovered and is prepared by ...
molybdenum
Science; General science
A chemical element, Mo, atomic number 42, and atomic weight 95.94, in the periodic table in the triad of transition elements that includes chromium (atomic number 24) and tungsten ...
nitrogen
Science; General science
A chemical element, N, atomic number 7, atomic weight 14.0067. Nitrogen, a gas under normal conditions, is the lightest element of periodic group 5 (nitrogen family).
niobium
Science; General science
A chemical element, Nb, atomic number 41 and atomic weight 92.906. In the United States this element was originally called columbium. The metallurgists and metals industry still ...
nickel
Science; General science
A chemical element, Ni, atomic number 28, a silver-white, ductile, malleable, tough metal. The atomic mass of naturally occurring nickel is 58.71.
nobelium
Science; General science
A chemical element, No, atomic number 102. Nobelium is a synthetic element produced in the laboratory. It decays by emitting an alpha particle, that is, a doubly charged helium ...
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