Terbium Element (Periodic Table)

Terbium

Terbium (Tb) is a chemical element of the periodic table, located in the period 6, and has the atomic number 65. It is the ninth element in the lanthanide series. It is a malleable, ductile, silvery-white metal, which is named after Ytterby, a village in Sweden, where it was mined. It is never found freely in nature and is counted as one of the rare earth elements.

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
– f block

FAQs on Terbium Element

Terbium
‣ What does terbium look like?

Appearance: silvery white
‣ Who discovered the element terbium and when?

Discovery and first isolation: Carl Gustaf Mosander (1843)
‣ Location of terbium on the periodic table

Terbium Periodic Table

Location: Terbium is found in the sixth row of the periodic table, next to the gadolinium element.
‣ What is terbium atomic mass number?

Atomic number (Z): 65
‣ Periodic symbol for terbium

Symbol: Tb
‣ What is the atomic weight for terbium?

Standard atomic weight: 158.925354
‣ Which block does terbium belong to?

Block: f-block
‣ What period is terbium in the periodic table?

Period: 6
Terbium atomic radius: empirical: 177 pm
Terbium covalent radius: 194±5 pm
Terbium melting point: 1629 K (1356 °C, 2473 °F)
Terbium boiling point: 3396 K (3123 °C, 5653 °F)
‣ How many electron shells does terbium have?

Electrons per shell: 2, 8, 18, 27, 8, 2
‣ What is the ground-state electron configuration of terbium (tb)?

Electron configuration: [Xe] 4f9 6s2
Terbium ionization energies:
1st: 565.8 kJ/mol
2nd: 1110 kJ/mol
3rd: 2114 kJ/mol
‣ What is the phase of terbium?

Phase (at r.t): solid
‣ What is the density of terbium?

Density (near r.t): 8.23 g/cm3
when liquid (at m.p): 7.65 g/cm3
Terbium magnetic ordering: paramagnetic at 300 K
Terbium natural occurrence: primordial
Oxidation state of terbium: +3, +4
‣ What’s the electronegativity of terbium?

Electronegativity: Pauling scale: 1.2
Terbium poisson’s ratio: α form: 0.261
Terbium heat of fusion: 10.15 kJ/mol
Terbium heat of vaporization: 391 kJ/mol
Terbium molar heat capacity: 28.91 J/(mol K)
Terbium molar magnetic susceptibility: +146000 × 10-6 cm3/mol (273 K)
Speed of sound in terbium: 2620 m/s (at 20 °C)
‣ What is the crystal structure of terbium?

Crystal structure: hexagonal close-packed (hcp)
Thermal expansion of terbium: at r.t α, poly: 10.3 µm/(m.K)
Thermal conductivity of terbium: 11.1 W/(m.K)
Terbium electrical resistivity: α, poly: 1.150 µΩ.m (at r.t)
‣ Terbium hardness

Vickers hardness: 450-865 MPa
Brinell hardness: 675-1200 MPa
Young’s modulus of terbium: α form: 55.7 GPa
Shear modulus of terbium: α form: 22.1 GPa
Bulk modulus of terbium: α form: 38.7 GPa
Terbium CAS number: 7440-27-9

‣ Terbium vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)17891979(2201)(2505)(2913)(3491)

‣ How many isotopes does terbium have?

Main isotopes of terbium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
157Tbsyn71 yε157Gd
158Tbsyn180 yε
β
158Gd
158Dy
159Tb100 %stable

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