meitnerium definition

  • noun:
    • An artificially produced radioactive factor with atomic quantity 109 whose most long-lived isotopes have actually mass variety of 266 and 268 with half-lives of 3.4 milliseconds and 70 milliseconds, respectively. Also known as unnilennium. See Table at factor.
    • A transuranic chemical element (symbolization Mt) with atomic quantity 109.
    • a radioactive transuranic element

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