Taking into account the atomic numbers (and not specific isotopes of each element) this list contains the radiactive elements ir order of atomic number.
The atomic number is Z.
Tecnecium, Tc : Z = 43
Prometium, Pm: Z = 61
Polonium, Po: Z = 84
Astatine, At: Z = 85
Radon, Rn: Z = 86
Francium, Fr: Z = 87
Radium, Ra: Z = 88
Actinium Ac: Z = 89
Thorium, Th: Z = 90
Protactinium, Pa: Z = 91
Uranium, U: Z = 92
Neptunium, Np: Z = 93
Plutonium, Pu: Z = 94
Americium, Am: Z = 95
Curium, Cm: Z = 96
Berkelium, Bk: Z = 97
Californium, Cf: Z = 98
Einstenium, Es: Z = 99
Fermium, Fm: Z = 100
Mendelevium, Md: Z = 101
Nobelium, No: Z = 102
Lawrencium, Lr: Z = 103
Rutherfordium, Rf: Z = 104
Dubnium, Db: Z = 105
Seaborgium, Sg: Z = 106
Bhorium, Bh: Z = 107
Hassium, Hs: Z = 108
Meitnerium, Mt: Z = 109
Darmstadium, Ds: Z = 110
Roentgenium, Rg: Z = 111
Copernicium, Cn: Z = 112
Nihonium, Nh: Z = 113
Flerovium, Fl: Z = 114
Moscovium, Mc: Z = 115
Livermorium, Lv: Z = 116
Tennessine, Ts: Z = 117
Oganesson, Og: Z = 118
Remeber, other elements, although are not radiactive, do have radiactive isotopes.