A short-lived, radioactive artificial transuranic element made out of californium and whose most steady isotope features a mass amount of 262 with a half-life of 3.6 hours; atomic number 103. See Table at factor.
A transuranic chemical element (symbol Lr, formerly Lw) with atomic number 103.
A transuranic section of atomic quantity 103. It was found in 1961 by bombardment of californium in a cyclotron with boron nuclei. Other isotopes were prepared in 1965 at Dubna. The atomic weight quite steady isotope is 256, having a half-life of 35 seconds. Expression Lr.
a radioactive transuranic factor synthesized from californium