"the atomic number of an extra stable strongly bound atomic nucleus: 2, 8, 20, 28, 50, 82 or 126"@en-us . "0"^^ . "magic number"@en-us . . "0"^^ . "113598960"^^ . . . . . . . "112832951"@en-us . "109771122"@en-us . "magic number"^^ . . "13598960-n"^^ . .