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Francium vs Terbium

Francium
Terbium
Terbium vs Francium


Periodic Table
Symbol
Fr   
Tb   
Group Number
1   
17
Not Available   
Period Number
7   
6   
Block
s block   
f block   
Element Family
Alkali   
Lanthanide   
CAS Number
7440735   
18
7440279   
99+
Space Group Name
Not Available   
P63/mmc   
Space Group Number
Not Available   
194.00   
5
Facts
Interesting Facts
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  
  • At times Terbium metal acts same as Calcium.
  • Terbium metal closely similar to Lanthanum metal.
  
Sources
Formed by Decay Process, Mining   
Found in Minerals, Found with Other Rare Earth Metals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Marguerite Perey   
Carl Gustaf Mosander   
Discovery
In 1939   
In 1842   
Abundance
  
  
Abundance In Universe
Not Available   
5 * 10-8 %   
27
Abundance In Sun
~-9999 %   
~0.00000001 %   
29
Abundance In Meteorites
Not Available   
0.00 %   
99+
Abundance In Earth's Crust
Not Available   
0.00 %   
40
Abundance In Oceans
Not Available   
0.00 %   
99+
Uses
Uses & Benefits
  • Francium has no known uses as it has a half life of only 22 minutes.
  
  • Terbium salts are used in optical devices like laser devices.
  • Terbium’s alloy lengthens and shortens the magnetic field and this effect forms loudspeaker.
  
Industrial Uses
NA   
Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
NA   
Alloys   
Biological Properties
  
  
Toxicity
NA   
Low Toxic   
Present in Human Body
No   
No   
In Blood
0.00 Blood/mg dm-3   
37
Not Available   
In Bone
0.00 p.p.m.   
36
Not Available   
Physical Properties
Melting Point
27.00 °C   
99+
1,356.00 °C   
33
Boiling Point
677.00 °C   
99+
3,123.00 °C   
29
Appearance
  
  
Physical State
Solid   
Solid   
Color
NA   
Silvery White   
Luster
NA   
Metallic   
Hardness
  
  
Brinell Hardness
Not Available   
677.00 MPa   
17
Vickers Hardness
Not Available   
863.00 MPa   
13
Speed of Sound
Not Available   
2,620.00 m/s   
35
Optical Properties
  
  
Allotropes
No   
No   
α Allotropes
Not Available   
Not Available   
β Allotropes
Not Available   
Not Available   
γ Allotropes
Not Available   
Not Available   
Chemical Properties
Chemical Formula
Fr   
Tb   
Isotopes
  
  
Known Isotopes
33   
6
26   
13
Electronegativity
  
  
Pauling Electronegativity
0.70   
99+
Not Available   
Allred Rochow Electronegativity
0.86   
99+
1.10   
30
Mulliken-Jaffe Electronegativity
0.68   
25
Not Available   
Allen Electronegativity
0.67   
99+
Not Available   
Electropositivity
  
  
Pauling Electropositivity
3.30   
1
Not Available   
Ionization Energies
  
  
1st Energy Level
380.00 kJ/mol   
99+
603.40 kJ/mol   
99+
2nd Energy Level
Not Available   
1,174.80 kJ/mol   
99+
3rd Energy Level
Not Available   
2,417.00 kJ/mol   
99+
4th Energy Level
Not Available   
4,203.00 kJ/mol   
31
Electrochemical Equivalent
8.32 g/amp-hr   
1
1.98 g/amp-hr   
31
Electron Work Function
Not Available   
3.00 eV   
36
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
87   
31
65   
99+
Electron Configuration
[Rn] 7s1   
[Xe] 4f9 6s2   
Crystal Structure
Body Centered Cubic (BCC)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
HCP-Crystal-Structure-of-Terbium.jpg#100   
Atom
  
  
Number of Protons
87   
31
65   
99+
Number of Neutrons
136   
17
94   
36
Number of Electrons
87   
31
65   
99+
Radius of an Atom
  
  
Atomic Radius
Not Available   
177.00 pm   
17
Covalent Radius
260.00 pm   
1
194.00 pm   
16
Van der Waals Radius
348.00 pm   
1
221.00 pm   
22
Atomic Weight
223.00 amu   
27
158.93 amu   
99+
Atomic Volume
Not Available   
19.20 cm3/mol   
22
Adjacent Atomic Numbers
  
  
Previous Element
Polonium
  
Gadolinium
  
Next Element
Radium
  
Dysprosium
  
Valence Electron Potential
8.00 (-eV)   
99+
46.80 (-eV)   
33
Lattice Constant
Not Available   
360.10 pm   
36
Lattice Angles
NA   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.58   
13
Mechanical Properties
Density
  
  
Density At Room Temperature
1.87 g/cm3   
99+
8.23 g/cm3   
99+
Density When Liquid (at m.p.)
Not Available   
7.65 g/cm3   
30
Tensile Strength
Not Available   
60.00 MPa   
17
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.00 (Pa)   
29
Vapor Pressure at 2000 K
Not Available   
12.50 (Pa)   
8
Elasticity properties
  
  
Shear Modulus
Not Available   
22.10 GPa   
32
Bulk Modulus
Not Available   
38.70 GPa   
33
Young's Modulus
Not Available   
55.70 GPa   
34
Poisson Ratio
Not Available   
0.26   
21
Other Mechanical Properties
NA   
Ductile, Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
Not Available   
8.23   
39
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Poor Conductor   
Conductor   
Resistivity
3.00 nΩ·m   
99+
1.15 nΩ·m   
99+
Electrical Conductivity
0.03 106/cm Ω   
40
0.01 106/cm Ω   
99+
Electron Affinity
Not Available   
50.00 kJ/mol   
21
Thermal Properties
Specific Heat
Not Available   
0.18 J/(kg K)   
33
Molar Heat Capacity
Not Available   
28.91 J/mol·K   
9
Thermal Conductivity
15.00 W/m·K   
99+
11.10 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
10.30 µm/(m·K)   
38
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
330.90 kJ/mol   
26
Enthalpy of Fusion
Not Available   
10.80 kJ/mol   
34
Enthalpy of Atomization
71.00 kJ/mol   
99+
314.00 kJ/mol   
33
Standard Molar Entropy
Not Available   
73.20 J/mol.K   
10
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