magic number

/ˌmædʒɪk ˌnʌmbər/
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Other forms: magic numbers

Definitions of magic number
  1. noun
    the atomic number of an extra stable strongly bound atomic nucleus: 2, 8, 20, 28, 50, 82 or 126
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    type of:
    atomic number
    the order of an element in Mendeleyev's table of the elements; equal to the number of protons in the nucleus or electrons in the neutral state of an atom of an element
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