1 Jan 1913 Jahr - NIELS BOHR (1885-1962 CE) date of discovery (1913 CE) Atom is composed of negatively charged electrons traveling in separate orbits around a positively charged nucleus. Atoms absorb or emit radiation when electrons on subatomic level jump between the allowed and stationary states. Discovered that the number of electrons in the outer orbit determines the properties of an element. Bohr’s work contributed significantly to scientists' understanding of nuclear fission.
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1 Jan 1913 Jahr
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