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unnilennium

[yoo-ni-len-ee-uh m] /ˌyu nɪˈlɛn i əm/
noun, Chemistry, Physics.
1.
former name of meitnerium. Symbol: Une.
Also called element 109.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for unnilennium

Mt

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

Learn more about Mt with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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