HISTORY OF DISCOVERY OF RADIOACTIVE ELEMENTS 1896 Discovery of radioactivity by A. H. Becquerel
84
Po
Ra
88
Polonium
1899
1898 Discovery of Polonium and Radium
Radium
Ac
1908
Rn
1918
Pa
89
86
91
Actinium
Radon
Protactinium
1938 Otto Hahn and Fritz Strassmann discover the neutron induced nuclear fission
1934 Enrico Fermi proposed to irradiate Uranium with neutrons in order to synthesize heavier elements
1940 G. Flerov and K. Petrzhak discover the spontaneous nuclear fission
At
85
Astatine
RADIOACTIVITY PERIOD 1896
1940
93
Np
94
Neptunium
Pu
Am
Plutonium
Cm
95
96
Americium
Curium
97
Bk
Cf
Es
98
Berklium
Californium
Fm
99
100
Einsteinium
Fermium
SYNTHESIS OF TRANSURANIUM ELEMENTS VIA NEUTRON CAPTURE 1940
1960
Md
No
101
102
Mendelevium
Nobelium
Lr
Rf
Db
103
104
105
Lowrencium
Rutherfordium
Dubnium
Sg
106
Seaborgium
Glenn Seaborg
SYNTHESIS OF TRANSFERMIUM ELEMENTS IN FUSION OF LIGHT PROJECTILES AND HEAVY TARGETS 1960
1980
Bh
Mt
Hs
107
109
108
Bohrium
Meitnerium
Hassium
110
Ds
Darmstadtium
Rg
Cn
111
112
Roentgenium
Copernicium
Nh
113
Nihonium
S Y N T H E S I S O F T R A N S A C T I N O I D E L E M E N T S I N C O L D F U S I O N ( Pb A N D Bi A S T A R G E T N U C L E I ) 1980 Georgiy Flerov
2006 114
Fl
Flerovium
Lv
Og
116
118
Livermorium
Oganesson
SYNTHESIS OF SUPERHEAVY ELEMENTS IN 1999
Yuri Oganessian
48
Mc
Ts
115
117
Moscovium
Tennessine
Ca - I N D U C E D R E A C T I O N S W I T H A C T I N I D E T A R G E T S 2018