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Cerium vs Bohrium

Cerium
Bohrium
Bohrium vs Cerium


Periodic Table
Symbol
Ce  
Bh  
Group Number
3  
15
7  
11
Period Number
6  
7  
Block
f block  
d block  
Element Family
Lanthanide  
Transition Metal  
CAS Number
7440451  
99+
54037148  
12
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
276.00  
1
Facts
Interesting Facts
  • Cerium is a rare earth metal but still it is not rare at all.
  • It’s non-toxic compound Cerium sulfide has a rich red color and it is used as a pigment.
  • Cerium metal is also used in Flat screen TVs, light bulb, floodlights, etc.
  
  • Bohrium metal is also known as Unnilseptium (Uns) and Nielsbohrium (Ns).
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Found in Minerals, Mining, Synthetically Produced  
History
  
  
Who Discovered
Martin Heinrich Klaproth, Jöns Jakob Berzelius, Wilhelm Hisinger  
Gesellschaft für Schwerionenforschung  
Discovery
In 1803  
In 1981  
Abundance
  
  
Abundance In Universe
0.00 %  
17
0.00 %  
37
Abundance In Sun
0.00 %  
23
-  
Abundance In Meteorites
0.00 %  
27
0.00 %  
99+
Abundance In Earth's Crust
0.01 %  
18
0.00 %  
99+
Abundance In Oceans
0.00 %  
33
-  
Abundance In Humans
0.00 %  
24
-  
Uses
Uses & Benefits
  • It is used to include flints for cigarette lighters.
  • Its compound Cerium (Ill) Oxide is used as a catalyst; it is put inside the walls of the oven as it prevents from the buildup of cooking residues.
  
  • Currently known uses of Bohrium metal are limited to research purpose only.
  
Industrial Uses
Chemical Industry  
-  
Medical Uses
Medical Research  
-  
Other Uses
Alloys  
Research Purposes  
Biological Properties
  
  
Toxicity
Moderately Toxic  
-  
Present in Human Body
Yes  
No  
In Blood
0.00 Blood/mg dm-3  
30
0.00 Blood/mg dm-3  
40
In Bone
2.70 p.p.m.  
14
0.00 p.p.m.  
99+
Physical
Melting Point
795.00 °C  
99+
-  
Boiling Point
3,257.00 °C  
24
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
-  
Luster
Lustrous  
Unknown Luster  
Hardness
  
  
Mohs Hardness
2.50  
15
7.00  
3
Brinell Hardness
186.00 MPa  
99+
270.00 MPa  
99+
Vickers Hardness
210.00 MPa  
99+
2,700.00 MPa  
4
Speed of Sound
2,100.00 m/s  
99+
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
2.20  
9
1.50  
36
Reflectivity
68.00 %  
15
59.00 %  
24
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ce  
Bh  
Isotopes
  
  
Known Isotopes
30  
9
5  
32
Electronegativity
  
  
Pauling Electronegativity
1.12  
99+
2.00  
8
Sanderson Electronegativity
1.12  
37
1.30  
25
Allred Rochow Electronegativity
1.08  
32
1.30  
25
Mulliken-Jaffe Electronegativity
1.12  
99+
1.30  
33
Allen Electronegativity
1.12  
99+
2.00  
6
Electropositivity
  
  
Pauling Electropositivity
2.88  
11
2.00  
99+
Ionization Energies
  
  
1st Energy Level
534.40 kJ/mol  
99+
742.90 kJ/mol  
23
2nd Energy Level
1,050.00 kJ/mol  
99+
1,688.50 kJ/mol  
31
3rd Energy Level
1,949.00 kJ/mol  
99+
2,566.50 kJ/mol  
99+
4th Energy Level
3,547.00 kJ/mol  
99+
3,598.90 kJ/mol  
99+
5th Energy Level
6,325.00 kJ/mol  
37
4,727.80 kJ/mol  
99+
6th Energy Level
7,490.00 kJ/mol  
38
5,991.70 kJ/mol  
99+
7th Energy level
5,340.00 kJ/mol  
99+
7,226.80 kJ/mol  
34
8th Energy Level
5,340.00 kJ/mol  
99+
7,100.00 kJ/mol  
33
9th Energy Level
5,340.00 kJ/mol  
99+
5,800.00 kJ/mol  
99+
10th Energy Level
5,340.00 kJ/mol  
99+
7,100.00 kJ/mol  
35
11th Energy Level
5,340.00 kJ/mol  
99+
8,200.00 kJ/mol  
25
12th Energy Level
5,340.00 kJ/mol  
99+
82,700.00 kJ/mol  
4
13th Energy Level
5,650.00 kJ/mol  
99+
7,100.00 kJ/mol  
29
14th Energy Level
5,340.00 kJ/mol  
99+
8,200.00 kJ/mol  
17
15th Energy Level
53,400.00 kJ/mol  
99+
82,000.00 kJ/mol  
14
16th Energy Level
53,400.00 kJ/mol  
99+
71,100.00 kJ/mol  
20
17th Energy Level
534.40 kJ/mol  
99+
820.00 kJ/mol  
31
18th Energy Level
5,340.00 kJ/mol  
99+
8,200.00 kJ/mol  
20
19th Energy Level
534.40 kJ/mol  
99+
820.80 kJ/mol  
28
20th Energy Level
534.00 kJ/mol  
99+
820.00 kJ/mol  
21
21st Energy Level
5,346.00 kJ/mol  
24
8,200.00 kJ/mol  
11
22nd Energy Level
594.00 kJ/mol  
99+
820.00 kJ/mol  
16
23rd Energy Level
5,346.00 kJ/mol  
26
8,200.00 kJ/mol  
8
24th Energy Level
565.50 kJ/mol  
99+
820.00 kJ/mol  
12
25th Energy Level
534.40 kJ/mol  
99+
820.00 kJ/mol  
10
26th Energy Level
565.50 kJ/mol  
99+
820.00 kJ/mol  
10
27th Energy Level
565.50 kJ/mol  
99+
820.00 kJ/mol  
9
28th Energy Level
565.50 kJ/mol  
99+
820.00 kJ/mol  
15
29th Energy Level
565.50 kJ/mol  
99+
820.00 kJ/mol  
14
30th Energy Level
594.00 kJ/mol  
99+
820.00 kJ/mol  
10
Electrochemical Equivalent
1.74 g/amp-hr  
99+
3.00 g/amp-hr  
21
Electron Work Function
2.84 eV  
99+
4.90 eV  
12
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes  
Atomic
Atomic Number
58  
99+
107  
11
Electron Configuration
[Xe] 4f1 5d1 6s2  
[Rn] 5f14 6d5 7s2  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
DHCP-Crystal-Structure-of-Cerium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
58  
99+
107  
11
Number of Neutrons
82  
99+
155  
9
Number of Electrons
58  
99+
107  
11
Radius of an Atom
  
  
Atomic Radius
181.80 pm  
14
128.00 pm  
99+
Covalent Radius
204.00 pm  
8
141.00 pm  
99+
Van der Waals Radius
235.00 pm  
21
0.00 pm  
99+
Atomic Weight
140.12 amu  
99+
270.00 amu  
8
Atomic Volume
20.67 cm3/mol  
27
23.70 cm3/mol  
14
Adjacent Atomic Numbers
  
  
Previous Element
Lanthanum
  
Seaborgium
  
Next Element
Praseodymium
  
Hassium
  
Valence Electron Potential
41.78 (-eV)  
99+
27.20 (-eV)  
99+
Lattice Constant
362.00 pm  
38
-  
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.59  
31
1.57  
99+
Mechanical
Density
  
  
Density At Room Temperature
6.77 g/cm3  
99+
37.10 g/cm3  
3
Density When Liquid (at m.p.)
6.55 g/cm3  
99+
37.10 g/cm3  
3
Tensile Strength
270.00 MPa  
17
152.00 MPa  
24
Viscosity
0.00  
23
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
36
0.00 (Pa)  
37
Vapor Pressure at 2000 K
1.04 (Pa)  
13
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
13.50 GPa  
99+
28.00 GPa  
32
Bulk Modulus
21.50 GPa  
99+
37.00 GPa  
99+
Young's Modulus
33.60 GPa  
99+
0.00 GPa  
99+
Poisson Ratio
0.24  
27
0.35  
9
Other Mechanical Properties
Ductile, Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
6.77  
99+
37.00  
5
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
7
0.00 H/m  
11
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
828.00 nΩ·m  
3
6.50 nΩ·m  
99+
Electrical Conductivity
0.01 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
-  
Thermal
Specific Heat
0.19 J/(kg K)  
33
0.10 J/(kg K)  
99+
Molar Heat Capacity
26.94 J/mol·K  
30
37.10 J/mol·K  
2
Thermal Conductivity
11.30 W/m·K  
99+
37.00 W/m·K  
36
Critical Temperature
1,071.00 K  
99+
1,323.00 K  
99+
Thermal Expansion
6.30 µm/(m·K)  
99+
14.30 µm/(m·K)  
28
Enthalpy
  
  
Enthalpy of Vaporization
414.00 kJ/mol  
22
270.50 kJ/mol  
99+
Enthalpy of Fusion
5.46 kJ/mol  
99+
-  
Enthalpy of Atomization
381.00 kJ/mol  
31
-  
Standard Molar Entropy
72.00 J/mol.K  
12
57.00 J/mol.K  
30
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