Mononuclidic element
Complete list of the 22 mononuclidic elements
Columns: Element | Nuclide | Z ( p ) | N ( n ) | isotopic mass ( u )
beryllium | 9 Be | 4 | 5 | 9.012 182(3) | fluorine | 19 F | 9 | 10 | 18.998 403 2(5) | sodium | 23 Na | 11 | 12 | 22.989 770(2) | aluminium | 27 Al | 13 | 14 | 26.981 538(2) | phosphorus | 31 P | 15 | 16 | 30.973 761(2) | scandium | 45 Sc | 21 | 24 | 44.955 910(8) | manganese | 55 Mn | 25 | 30 | 54.938 049(9) | cobalt | 59 Co | 27 | 32 | 58.933 200(9) | arsenic | 75 As | 33 | 42 | 74.921 60(2) | yttrium | 89 Y | 39 | 50 | 88.905 85(2) | niobium | 93 Nb | 41 | 52 | 92.906 38(2) | rhodium | 103 Rh | 45 | 58 | 102.905 50(2) | iodine | 127 I | 53 | 74 | 126.904 47(3) | caesium | 133 Cs | 55 | 78 | 132.905 45(2) | praseodymium | 141 Pr | 59 | 82 | 140.907 65(2) | terbium | 159 Tb | 65 | 94 | 158.925 34(2) | holmium | 165 Ho | 67 | 98 | 164.930 32(2) | thulium | 169 Tm | 69 | 100 | 168.934 21(2) | gold | 197 Au | 79 | 118 | 196.966 55(2) | bismuth | 209 Bi | 83 | 126 | 208.980 38(2) | thorium | 232 Th | 90 | 142 | 232.038 1(1) | protactinium | 231 Pa | 91 | 140 | 231.035 88(2)