meitnerium

[ mahyt-nur-ee-uhm ]

noun

, Chemistry, Physics.

1. a superheavy, synthetic, radioactive element with a very short half-life. : Mt; : 109.

meitnerium

/ ˈmaɪtnɪərɪəm /

noun

1. a synthetic element produced in small quantities by high-energy ion bombardment. Symbol: Mt; atomic no: 109

meitnerium

/ mīt-nûr′ē-əm /

1. A synthetic, radioactive element that is produced by bombarding bismuth with iron ions. Its most long-lived isotopes have mass numbers of 266 and 268 with half-lives of 3.4 milliseconds and 70 milliseconds, respectively. Atomic number 109.
2. See Periodic Table

Word History and Origins

Origin of meitnerium¹

First recorded in 1975–80; officially assigned to element 109 in 1997; named after Austrian physicist Lise Meitner; -ium ( def )

Word History and Origins

Origin of meitnerium¹

C20: named after Lise Meitner