thallium

(thal′ē-ŭm )

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[Gr. thallos, a young shoot + -ium (1)]
SYMB: Tl A metallic element, atomic weight (mass) 204.37, atomic number 81, specific gravity 11.85. Its salts may be poisonous in overdose; its radioisotope is used to assess myocardial perfusion and viability.
CAS # 7440-28-0

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