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element 109

noun, Chemistry, Physics.
Formerly unnilennium.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for element 109

Mt

an artificially produced element belonging to the transuranium group, atomic number 109. It is predicted to have chemical properties resembling those of iridium.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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