Actinide (Periodic Table)

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Actinide

The actinides (or actinoids) in the periodic table include the 15 chemical elements from atomic number 89 to 103: actinium (Ac), thorium (Th), protactinium (Pa), uranium (U), neptunium (Np), plutonium (Pu), americium (Am), curium (Cm), berkelium (Bk), californium (Cf), einsteinium (Es), fermium (Fm), mendelevium (Md), nobelium (No), and lawrencium (Lr).

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
– actinide

FAQs on Actinide

‣ Is terbium an actinide?

Terbium is a lanthanide, not an actinide.
‣ What is the first element in the actinide series?

The actinium element is the first in the actinide series.
‣ How many actinides are found in nature?

The six actinides from atomic numbers 89 to 94 are naturally occurring elements.
‣ Which element of actinide series has the highest melting point?

The thorium element in the actinide series has the highest melting point.
‣ Which element is the heaviest actinide that occurs naturally on earth?

The uranium element is the heaviest actinide that occurs naturally on earth.
‣ Are all actinides transuranium elements?

The actinides from atomic numbers 93 to 103 are transuranium elements.
‣ Where are actinides found?

Actinides are in the seventh row of the periodic table.
‣ Which subshell is represented by the actinide series?

The actinide series in the periodic table represents the f subshell.
‣ Are actinides rare earth metals?

The actinides are not rare earth metals.
‣ Are actinides metals or nonmetals?

All actinides are metals.
‣ Are actinides synthetic elements?

The actinides from atomic numbers 95 to 103 are synthetic elements.

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