Assertion: fermium's isotope | /r/MadeOf | magic numbers[b
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text: Their abundance table revealed larger than average abundances of natural isotopes containing magic numbers[b] of neutrons as well as abundance peaks about 10 amu lighter than stable nuclei containing magic numbers of neutrons which were also in abundance, suggesting that radioactive neutron-rich nuclei having the magic neutron numbers but roughly ten fewer protons were formed.