Chemicool
Tb
65
158.9254
Terbium
General
|
States
|
Energies
|
Oxidation & Electrons
|
Appearance & Characteristics
Reactions
|
Other Forms
|
Radius
|
Conductivity
|
Abundance
Encyclopedia Britannica articles
General
Name
Terbium
Symbol
Tb
atomic number
65
Atomic weight
158.9254
Density @ 293 K
8.27 g/cm3
Atomic volume
19.2 cm3/mol
Group
Rare Earth, Lanthanides
discovered
1843
States
state (s, l, g)
s
melting point
1633.2 K
boiling point
3073 K
Heat of fusion
10.80 kJ/mol
Heat of vaporization
330.90 kJ/mol
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Energies
1st ionization energy
564.7 kJ/mole
electronegativity
1.21
2nd ionization energy
1112 kJ/mole
electron affinity
50 kJ/mole
3rd ionization energy
2114 kJ/mole
Specific heat
0.18 J/gK
heat atomization
389 kJ/mole atoms
Oxidation & Electrons
Shells
2,8,18,27,8,2
electron configuration
[Xe] 4f9 6s2
minimum oxidation number
0
maximum oxidation number
4
min. common oxidation no.
0
max. common oxidation no.
3
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Appearance & Characteristics
structure
hcp: hexagonal close pkd
color
silvery-white
uses
alloys
toxicity
hardness
mohs
characteristics
soft
Reactions
reaction with air
vigorous, = Tb4O7 (approx.)
reaction with 6M HCl
mild, = H2, TbCl3
reaction with 6M HCl
mild, = H2, TbCl3
reaction with 15M HNO3
mild, = Tb(NO3)3
reaction with 6M NaOH
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Other Forms
number of isotopes
1
hydride(s)
TbH2 TbH3
oxide(s)
TbO2 Tb4O7
chloride(s)
TbCl3
Radius
ionic radius (2- ion)
pm
ionic radius (1- ion)
pm
atomic radius
177 pm
ionic radius (1+ ion)
pm
ionic radius (2+ ion)
pm
ionic radius (3+ ion)
106.3 pm
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Conductivity
thermal conductivity
11.1 J/m-sec-deg
electrical conductivity
8.8 1/mohm-cm
polarizability
25.5 A^3
Abundance
source
Monazite(phosphate),bastnaesite
rel. abund. solar system
-1.220 log
abundance earth's crust
0 log
cost, pure
1800 $/100g
cost, bulk
$/100g
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