Why is it said that the discovery of nobelium was controversial? When was lawrencium discovered?

In 1966, the researchers at the Joint Institute for Nuclear Research in Dubna, Russia, synthesized nobelium for the first time. The element was named after Alfred Nobel.

Element 102 was proposed to be named as nobelium in 1957 by scientists from the Nobel Institute of Physics in Sweden, who thought they had produced it. But they had not made nobelium. Later, in 1958, scientists at the University of California, Berkeley claimed that they had made the element, but IUPAC (International Union of Pure and Applied Chemistry) ruled that the discovery was most likely to have been made in Dubna in 1966. Since nobelium is produced in small quantities only, it is mostly used for scientific research.

Lawrencium was synthesized by Albert Ghiorso, Torbjørn Sikkeland, Almon Larsh, and Robert Latimer at the Lawrence Berkeley National Laboratory, California in 1961. It gets its name after Ernest Lawrence, who invented the cyclotron particle accelerator.

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