Elements
65

Tb

Terbium

Terbium (Tb) is a silvery-gray coloured metal that has the atomic number 65 in the periodic table. It is a Lanthanide metal. It has the symbol Tb.

Terbium was discovered by Carl Gustaf Mosander in 1843, when studying the ore Yttira. Terbium is a malleable and ductile metal and prefers to exist as a +3 ion. The ion emits a strong green luminescence when excited. Due to its luminescence it is used in colour phosphors in lighting. It is also used in euro bank notes to prevent forgeries. Due to its magnetism it is also used in the electric motors of hybrid cars. It is not found in free nature but found in minerals. It is a solid metal at room temperature with a melting point of 1356°c and a boiling point of 3230°c.

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FAQ's

What is the Melting Point for Terbium?

Terbium has a Melting Point of 1356°F, meaning at 1356°F it will turn to a liquid.

What is the Boiling Point for Terbium?

Terbium has a Boiling Point of 3230°F, meaning at 3230°F it will turn to a Gas.

What is the Electronegativity of Terbium?

Terbium's Electronegativty is 1.1. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Terbium?

Terbium has a Heat of Vaporization of 330.9 kJ/mol.

Uses

It is used in modest amounts in special lasers and solid-state devices.

Sources

Found with other rare earths in monazite sand, which typically contain 0.03% terbium. Other sources are xenotime and euxenite, both of which are oxide mixtures that can contain up to 1% terbium.

65
Protons
65
Electrons
94
Neutrons

Tb

Element Symbol
Tb
Atomic Weight
158.925
Atomic Number
65
State
Solid
Melting Point
Unknown
1356
°C
Boiling Point
3230
Unknown
°C
Heat of Vaporization
330.9
Unknown
kJ/mol
Crystal Structure
Hexagonal
Thermoconductivity
0.111
Unknown
W/cmK
Shells
2,8,18,27,8,2
Group
Lanthanide
Period
6
Block
F Block
Orbitals
[Xe] 4f9 6s2
Coefficient of Thermal Expansion
9.4 10^-6 K^-1
Covalent Radius
1.59 Å
Density at 293K
8.27 g/cm³
Electrical Conductivity
0.00889 10^6/cm ohm
First Ionization Potential
5.8639 V
Second Ionization Potential
11.525 V
Third Ionization Potential
21.91 V
Ionic Radius
1.18 (+3) Å
Oxydation States
(3),4
Lattice Parameter
3.6011 Å
Lattice Parameter 2
--
Lattice Parameter 3
5.5876 Å
Pronounced

TUR-bi-em

Discovered by

Carl Mosander

Discovery date

1843

Orbital configuration
2,8,18,27,8,2

Download the Periodic Table

Explore Other Lanthanides

145
61

Pm

Promethium
150.36
62

Sm

Samarium
174.967
71

Lu

Lutetium
140.908
59

Pr

Praseodymium
151.964
63

Eu

Europium
162.5
66

Dy

Dysprosium
144.24
60

Nd

Neodymium
138.905
57

La

Lanthanum
173.045
70

Yb

Ytterbium
157.25
64

Gd

Gadolinium
140.116
58

Ce

Cerium
168.934
69

Tm

Thulium
164.93
67

Ho

Holmium
167.259
68

Er

Erbium
The lanthanide series contains 15 metallic elements from number 57 (lanthanum) to 71 (lutetium). They are located in group 3 and in the f-block of period six in the periodic table.
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Gadolinium

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Dysprosium

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