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Protactinium
Thorium
Actinium
Radium
Francium
Radon
Astatine
Polonium
Bismuth
Lead
Thallium
α
α
α
β⁻
β⁻
α
α
Ra
226
88
1602 Years
Th
234
90
27 Days
Pa
234
91
27 Days
Bi
214
83
20 Minutes
Po
218
84
3.1 Minutes
Pb
214
82
26.8
Minutes
Tl
210
81
1.3 Minutes
β⁻
At
218
85
1.5
Seconds
Pb
210
82
22.3 Years
Po
214
84
0.1643
Seconds
Th
230
90
75,380
α
α
Rn
222
86
3.8 Days
α
α
β⁻
U
238
4.5e9
Years
92
Uranium
U
234
245,500
Years
92
β⁻
α
β⁻
β⁻
Bi
210
83
Tl
206
81
4.2 Minutes
5 Days
Pb
206
82
Stable
Po
210
84
138 Days
α
β⁻
Hg
206
80
8.1 Minutes
α
Actinides
Alkali Metals
Alkaline Earth Metals
Halogens
Metalloids
Noble Gases
Poor Metals
Transition Metals
Mercury
Years
WITH INTERNETCheck the e of the middle PO, both Us and the 2nd Th