Bohrium

Bohrium is a synthetic, radioactive chemical element with atomic number 107 and symbol Bh. It is named after physicist Niels Bohr.

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Chemical element: A pure substance whose atoms all have the same number of protons. Bohrium is one element, defined by its 107 protons.
Synthesis of bohrium: The production of bohrium nuclei through nuclear reactions between lighter atomic nuclei. Early experiments created the first reported atoms of element 107.
Heavy-ion fusion: A nuclear reaction in which accelerated heavy nuclei collide and fuse into a heavier nucleus. Fusion reactions produce bohrium nuclei in accelerator experiments.
Bohrium-262: A bohrium isotope with mass number 262, observed in experiments at GSI in 1981. Its reported production supplied the first evidence for element 107.
Atomic number: The number of protons in an atom’s nucleus, which identifies its chemical element. The value 107 distinguishes bohrium from every other element.
Gesellschaft für Schwerionenforschung: A German heavy-ion research center, now part of the GSI Helmholtz Centre for Heavy Ion Research. Its Darmstadt team reported element 107 in 1981.
Nuclear decay: The spontaneous transformation of an unstable atomic nucleus into a more stable state. Bohrium’s radioactive isotopes are identified through their decay chains.
Bohrium-267: A bohrium isotope with mass number 267, produced in later heavy-ion experiments. Its decay properties helped establish bohrium’s isotope record.
Periodic table: A tabular arrangement of chemical elements ordered by atomic number and recurring properties. Bohrium occupies group 7 and period 7 among the transition metals.
Yuri Oganessian: A Soviet and Russian nuclear physicist known for research on superheavy elements. His Dubna group independently synthesized bohrium in experiments that contributed to confirmation.