(thing) by CentrX Fri May 05 2000 at 22:33:20
(From the Greek aktinos, "ray") A white, radioactive, metallic chemical element, the first member of the actinide series, found in pitchblende and other minerals or formed in reactors by the neutron irradiation of radium.

Symbol: Ac
Atomic number: 89
Atomic weight: 227 (isotope with the longest known half-life)
Density (at room temperature and pressure): 10.07 g/cc
Melting point: 1,050°C
Boiling point: 3,200°C
Ground state electron configuration: [Rn]6d17s2

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