Thallium - Wikipedia

Thallium is a chemical element with symbol Tl and atomic number 81. It is a gray post-transition metal that is not found free in nature. When isolated, thallium resembles tin, but discolors when exposed to air.

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GEOLOGIJA

ISSN 0016-7789 /print/ ISSN 1854-620X /online/ Geologija is a central Slovenian geological scentific journal. The first issue of the journal was published in 1953. It has an international advisory board.

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