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Also available:
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magic number
mag·ic num·ber
(
plural
mag·ic num·bers
)
noun
Definition:
specific number of protons or neutrons:
any of the numbers 2, 8, 20, 28, 50, 82, and 126 that represent the number of protons or neutrons in very stable atomic nuclei
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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