Standard State: solid at 298 K
Color: Silvery white
Discovered by Berzelius in 1828. Thorium occurs in thorite and in thorianite.
Large deposits of thorium minerals have been reported n New England and elsewhere,
but these have not yet been exploited. Thorium is now thought to be about three times as abundant as uranium and about as
abundant as lead or molybdenum. The metal is a source of nuclear power. There
probably more energy available for use from thorium in the minerals of the earth's crust
than from both uranium and fossil fuels. Works has been done is developing thorium
cycle converter-reactor systems.