出典:Wiktionary
出典:『Wiktionary』 (2026/04/25 00:01 UTC 版)
| Chemical element | ||||||||
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| Mt Atomic number 109 meitnerium |
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| Previous: ← hassium (Hs) | ||||||||
| Next: darmstadtium (Ds) → | ||||||||
| English Wikipedia article on Meitnerium |
| Chemical element | ||||||||
|---|---|---|---|---|---|---|---|---|
| Mt Atomic number 109 meitnerium |
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| Previous: ← hassium (Hs) | ||||||||
| Next: darmstadtium (Ds) → |
出典:Wikipedia
出典:『Wikipedia』 (2011/07/27 06:19 UTC 版)
Meitnerium (
/maɪtˈnɪəriəm/ myt-neer-ee-əm or /maɪtˈnɜriəm/ myt-nur-ee-əm) is a chemical element with the symbol Mt and atomic number 109. It is placed as the heaviest member of group 9 (or VIII) in the periodic table but a sufficiently stable isotope is not known at this time which would allow chemical experiments to confirm its position, unlike its lighter neighbours.