Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Element | Nuclide | Z ( p ) | N ( n ) | isotopic mass ( u ) |
| --- | --- | --- | --- | --- |
| beryllium | 9 Be | 4.0 | 5.0 | 9.012 182(3) |
| fluorine | 19 F | 9.0 | 10.0 | 18.998 403 2(5) |
| sodium | 23 Na | 11.0 | 12.0 | 22.989 770(2) |
| aluminium | 27 Al | 13.0 | 14.0 | 26.981 538(2) |
| phosphorus | 31 P | 15.0 | 16.0 | 30.973 761(2) |
| scandium | 45 Sc | 21.0 | 24.0 | 44.955 910(8) |
| manganese | 55 Mn | 25.0 | 30.0 | 54.938 049(9) |
| cobalt | 59 Co | 27.0 | 32.0 | 58.933 200(9) |
| arsenic | 75 As | 33.0 | 42.0 | 74.921 60(2) |
| yttrium | 89 Y | 39.0 | 50.0 | 88.905 85(2) |
| niobium | 93 Nb | 41.0 | 52.0 | 92.906 38(2) |
| rhodium | 103 Rh | 45.0 | 58.0 | 102.905 50(2) |
| iodine | 127 I | 53.0 | 74.0 | 126.904 47(3) |
| caesium | 133 Cs | 55.0 | 78.0 | 132.905 45(2) |
| praseodymium | 141 Pr | 59.0 | 82.0 | 140.907 65(2) |
| terbium | 159 Tb | 65.0 | 94.0 | 158.925 34(2) |
| holmium | 165 Ho | 67.0 | 98.0 | 164.930 32(2) |
| thulium | 169 Tm | 69.0 | 100.0 | 168.934 21(2) |
| gold | 197 Au | 79.0 | 118.0 | 196.966 55(2) |
| bismuth | 209 Bi | 83.0 | 126.0 | 208.980 38(2) |
| thorium | 232 Th | 90.0 | 142.0 | 232.038 1(1) |
| protactinium | 231 Pa | 91.0 | 140.0 | 231.035 88(2) |
Question:
What is the highest Z (p) when the N (n) is less than 30, and scandium is the element?
Answer:
21.0