unnilennium

[ yoo-ni-len-ee-uh m ]
/ ˌyu nɪˈlɛn i əm /

noun Chemistry, Physics.

former name of meitnerium. Symbol: Une
Also called element 109.

Words nearby unnilennium

unnail, unnamed, unnatural, unnecessary, unnerve, unnilennium, unnilhexium, unniloctium, unnilpentium, unnilquadium, unnilseptium

Definition for unnilennium (2 of 3)

meitnerium
[ mahyt-nur-ee-uh m ]
/ maɪtˈnɜr i əm /

noun Chemistry, Physics.

a superheavy, synthetic, radioactive element. Symbol: Mt; atomic number: 109.
Formerly unnilennium, element 109.

Origin of meitnerium

named after Austrian physicist Lise Meitner;see -ium

Definition for unnilennium (3 of 3)

element 109

noun Chemistry, Physics.

meitnerium.
Formerly unnilennium.

British Dictionary definitions for unnilennium

meitnerium
/ (ˈmaɪtnɪərɪəm) /

noun

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

Word Origin for meitnerium

C20: named after Lise Meitner

Scientific definitions for unnilennium

meitnerium
[ mīt-nûr′ē-əm ]

Mt

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. See Periodic Table.