There are 28 man-made elements on the periodic table, of which 8 may exist as trace elements in natural state
technetium (Tc), 43
promethium (Pm), 61
neptunium (Np), 93
plutonium (Pu), 94
americium (Am), 95
curium (Cm), 96
berkelium (Bk), 97
californium (Cf), 98
einsteinium (Es), 99
fermium (Fm), 100
mendelevium (Md), 101
nobelium (No), 102
lawrencium (Lr), 103
rutherfordium (Rf), 104
dubnium (Db), 105
seaborgium (Sg), 106
bohrium (Bh), 107
hassium (Hs), 108
meitnerium (Mt), 109
darmstadtium (Ds), 110
roentgenium (Rg), 111
copernicium (Cn), 112