Radioactive Element (Periodic Table)

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Radioactive Element

The radioactive elements in the periodic table are those elements that have no stable isotopes.

Here’s the list of 38 radioactive elements and their most stable isotopes:

Radioactive ElementsAtomic NumberMost Stable IsotopesHalf Life
Technetium43Tc-974.21 × 106 y
Promethium61Pm-14517.7 y
Bismuth83Bi-2092.01 × 1019 y
Polonium84Po-209125.2 y
Astatine85At-2108.1 h
Radon86Rn-2223.8235 d
Francium87Fr-22322.00 min
Radium88Ra-2261600 y
Actinium89Ac-22721.772 y
Thorium90Th-2321.405 × 1010 y
Protactinium91Pa-2313.276 × 104 y
Uranium92U-2357.04 × 108 y
Neptunium93Np-2372.144 × 106 y
Plutonium94Pu-2448.08 × 107 y
Americium95Am-2437370 y
Curium96Cm-2483.40 × 105 y
Berkelium97Bk-2471380 y
Californium98Cf-251898 y
Einsteinium99Es-252471.7 d
Fermium100Fm-257100.5 d
Mendelevium101Md-25851.5 d
Nobelium102No-25958 min
Lawrencium103Lr-26610 h
Rutherfordium104Rf-2671.3 h
Dubnium105Db-26828 h
Seaborgium106Sg-26914 min
Bohrium107Bh-27811.5 min
Hassium108Hs-26916 s
Meitnerium109Mt-28267 s
Darmstadtium110Ds-28114 s
Roentgenium111Rg-28610.7 min
Copernicium112Cn-28528 s
Nihonium113Nh-2869.5 s
Flerovium114Fl-29019 s
Moscovium115Mc-290650 ms
Livermorium116Lv-29357 ms
Tennessine117Ts-29451 ms
Oganesson118Og-2940.69 ms
group
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
period
1
 1
H
 2
He
2
 3
Li
 4
Be
 5
B
 6
C
 7
N
 8
O
 9
F
 10
Ne
3
 11
Na
 12
Mg
 13
Al
 14
Si
 15
P
 16
S
 17
Cl
 18
Ar
4
 19
K
 20
Ca
 21
Sc
 22
Ti
 23
V
 24
Cr
 25
Mn
 26
Fe
 27
Co
 28
Ni
 29
Cu
 30
Zn
 31
Ga
 32
Ge
 33
As
 34
Se
 35
Br
 36
Kr
5
 37
Rb
 38
Sr
 39
Y
 40
Zr
 41
Nb
 42
Mo
 43
Tc
 44
Ru
 45
Rh
 46
Pd
 47
Ag
 48
Cd
 49
In
 50
Sn
 51
Sb
 52
Te
 53
I
 54
Xe
6
 55
Cs
 56
Ba
 72
Hf
 73
Ta
 74
W
 75
Re
 76
Os
 77
Ir
 78
Pt
 79
Au
 80
Hg
 81
Tl
 82
Pb
 83
Bi
 84
Po
 85
At
 86
Rn
7
 87
Fr
 88
Ra
 104
Rf
 105
Db
 106
Sg
 107
Bh
 108
Hs
 109
Mt
 110
Ds
 111
Rg
 112
Cn
 113
Nh
 114
Fl
 115
Mc
 116
Lv
 117
Ts
 118
Og
57
La
 58
Ce
 59
Pr
 60
Nd
 61
Pm
 62
Sm
 63
Eu
 64
Gd
 65
Tb
 66
Dy
 67
Ho
 68
Er
 69
Tm
 70
Yb
 71
Lu
89
Ac
 90
Th
 91
Pa
 92
U
 93
Np
 94
Pu
 95
Am
 96
Cm
 97
Bk
 98
Cf
 99
Es
 100
Fm
 101
Md
 102
No
 103
Lr
– radioactive element

FAQs on Radioactive Element

‣ Is lead a radioactive element?

Lead is not a radioactive element.
‣ What atomic number is radioactive?

The elements having the atomic numbers 43, 61, and from 83 to 118 are radioactive.
‣ Is francium radioactive?

Francium is a radioactive element located in period 7 of the periodic table.
‣ Is calcium a radioactive element?

Calcium is not a radioactive element.
‣ How many of the radioactive elements are found in nature?

There are a total of 38 radioactive elements found in nature.
‣ Is the element gold radioactive?

Gold is not a radioactive element.
‣ Is technetium a radioactive?

Technetium is a radioactive element located in period 5 of the periodic table.
‣ Where do radioactive elements tend to be on the periodic table?

Most of the radioactive elements are in the seventh row of the periodic table.
‣ What radioactive element has the lowest atomic number?

The technetium element is a radioactive element with the lowest atomic number in the periodic table.
‣ Which scientist discovered the radioactive element radium?

A Polish-French physicist Marie Curie and French physicist Pierre Curie discovered the radioactive element radium in 1898.
‣ Is uranium a radioactive element?

Uranium is a radioactive element located in period 7 of the periodic table.
‣ Is cobalt a radioactive element?

Cobalt is not a radioactive element.
‣ Is radon a radioactive element?

Radon is a radioactive element located in period 6 of the periodic table.
‣ Are radioactive elements metals?

Except for nonmetal radon (Rn), all radioactive elements are metals.
‣ Are radioactive elements naturally occurring?

All radioactive elements (excluding elements from atomic numbers 95 to 118) are naturally occurring elements.

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