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Thorium
Thorium
is a
chemical element
with symbol
Th
and
atomic number
90. A
radioactive
actinide
metal
, thorium is one of only two significantly radioactive elements that still occur naturally in large quantities as a
primordial element
(the other being
uranium
). It was discovered in 1828 by the Norwegian
Reverend
and amateur mineralogist
Morten Thrane Esmark
and identified by the Swedish chemist
Jöns Jakob Berzelius
, who named it after
Thor
, the
Norse god
of thunder.
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