#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
  supertype:  #number  a concept of quantity derived from zero and units; "every number has a unique position in the sequence"
  subtype:  #magic_number__magicnumber  the atomic number of an extra stable strongly bound atomic nucleus: 2, 8, 20, 28, 50, 82 or 126

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