Definition of Thalium
Thallium, a rare metallic element similar to lead, but heavier,
discovered in 1861 by the green in the spectrum in the flame as it was
being volatilised.
- Wikipedia
Thal"li*um (?), n. [NL., fr. Gr. &?; young or
green shoot or branch, twig. So called from a characteristic bright
green line in its spectrum.] (Chem.) A rare metallic
element of the aluminium group found in some minerals, as certain pyrites,
and also in the lead-chamber deposit in the manufacture of sulphuric acid.
It is isolated as a heavy, soft, bluish white metal, easily oxidized in
moist air, but preserved by keeping under water. Symbol Tl. Atomic weight
203.7.
Thal"li*um (?), n. [NL., fr. Gr. &?; young or
green shoot or branch, twig. So called from a characteristic bright
green line in its spectrum.] (Chem.) A rare metallic
element of the aluminium group found in some minerals, as certain pyrites,
and also in the lead-chamber deposit in the manufacture of sulphuric acid.
It is isolated as a heavy, soft, bluish white metal, easily oxidized in
moist air, but preserved by keeping under water. Symbol Tl. Atomic weight
203.7.
- Webster's Unabridged Dictionary (1913)
- a metallic chemical element (symbol Tl) with atomic number 81.
Thallium - The Nuttall Encyclopedia
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