Quantity Symbol Value Avogadro's number NA 6.022 141 79 (30) x 10 23 particles/mol Bohr magneton μB=eℏ2me 9.274 009 15 (23) x 10 −24 J/T Bohr radius a0=ℏ2mee2ke 5.291 772 085 9 (36) x 10 −11 m
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