Actinide (Periodic Table)

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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