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Ruthenium vs Cerium

Ruthenium
Cerium
Cerium vs Ruthenium


Periodic Table
Symbol
Ru  
Ce  
Group Number
8  
10
3  
15
Period Number
5  
6  
Block
d block  
f block  
Element Family
Transition Metal  
Lanthanide  
CAS Number
7440188  
99+
7440451  
99+
Space Group Name
P63/mmc  
P63/mmc  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Ruthenium element has been extracted from used nuclear fuel.
  • Ruthenium metal also produces as a by-product of the Nickel mining.
  
  • 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.
  
Sources
By-product of Nickel Refining, Found in Minerals, Mining  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Karl Ernst Claus  
Martin Heinrich Klaproth, Jöns Jakob Berzelius, Wilhelm Hisinger  
Discovery
In 1844  
In 1803  
Abundance
  
  
Abundance In Universe
0.00 %  
21
0.00 %  
17
Abundance In Sun
0.00 %  
22
0.00 %  
23
Abundance In Meteorites
0.00 %  
26
0.00 %  
27
Abundance In Earth's Crust
0.00 %  
99+
0.01 %  
18
Abundance In Oceans
0.00 %  
38
0.00 %  
33
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • It is used for producing chip resistors and contact.
  • Ruthenium oxide is used to coat the anodes cells for chlorine production in chemical industry. It also works as catalysts for ammonia and acetic acid reaction.
  
  • 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.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry  
Chemical Industry  
Medical Uses
Medical Research  
Medical Research  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
Low Toxic  
Moderately Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
37
0.00 Blood/mg dm-3  
30
In Bone
0.00 p.p.m.  
99+
2.70 p.p.m.  
14
Physical
Melting Point
2,250.00 °C  
8
795.00 °C  
99+
Boiling Point
3,900.00 °C  
14
3,257.00 °C  
24
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
Lustrous  
Hardness
  
  
Mohs Hardness
6.50  
5
2.50  
15
Brinell Hardness
2,160.00 MPa  
3
186.00 MPa  
99+
Vickers Hardness
1,160.00 MPa  
14
210.00 MPa  
99+
Speed of Sound
5,970.00 m/s  
7
2,100.00 m/s  
99+
Optical Properties
  
  
Refractive Index
2.60  
4
2.20  
9
Reflectivity
6.00 %  
38
68.00 %  
15
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ru  
Ce  
Isotopes
  
  
Known Isotopes
26  
13
30  
9
Electronegativity
  
  
Pauling Electronegativity
2.20  
5
1.12  
99+
Sanderson Electronegativity
2.20  
8
1.12  
37
Allred Rochow Electronegativity
1.42  
19
1.08  
32
Mulliken-Jaffe Electronegativity
2.20  
6
1.12  
99+
Allen Electronegativity
1.54  
28
1.12  
99+
Electropositivity
  
  
Pauling Electropositivity
1.80  
99+
2.88  
11
Ionization Energies
  
  
1st Energy Level
710.20 kJ/mol  
32
534.40 kJ/mol  
99+
2nd Energy Level
710.22 kJ/mol  
99+
1,050.00 kJ/mol  
99+
3rd Energy Level
2,747.00 kJ/mol  
38
1,949.00 kJ/mol  
99+
4th Energy Level
7,107.00 kJ/mol  
12
3,547.00 kJ/mol  
99+
5th Energy Level
7,107.00 kJ/mol  
27
6,325.00 kJ/mol  
37
6th Energy Level
7,107.00 kJ/mol  
99+
7,490.00 kJ/mol  
38
7th Energy level
7,100.00 kJ/mol  
37
5,340.00 kJ/mol  
99+
8th Energy Level
4,700.00 kJ/mol  
99+
5,340.00 kJ/mol  
99+
9th Energy Level
5,600.00 kJ/mol  
99+
5,340.00 kJ/mol  
99+
10th Energy Level
7,100.00 kJ/mol  
35
5,340.00 kJ/mol  
99+
11th Energy Level
7,197.00 kJ/mol  
32
5,340.00 kJ/mol  
99+
12th Energy Level
7,190.00 kJ/mol  
99+
5,340.00 kJ/mol  
99+
13th Energy Level
7,100.00 kJ/mol  
29
5,650.00 kJ/mol  
99+
14th Energy Level
710.00 kJ/mol  
99+
5,340.00 kJ/mol  
99+
15th Energy Level
71,000.00 kJ/mol  
25
53,400.00 kJ/mol  
99+
16th Energy Level
71,000.00 kJ/mol  
21
53,400.00 kJ/mol  
99+
17th Energy Level
710.20 kJ/mol  
99+
534.40 kJ/mol  
99+
18th Energy Level
7,100.00 kJ/mol  
31
5,340.00 kJ/mol  
99+
19th Energy Level
710.20 kJ/mol  
38
534.40 kJ/mol  
99+
20th Energy Level
710.00 kJ/mol  
32
534.00 kJ/mol  
99+
21st Energy Level
710.20 kJ/mol  
99+
5,346.00 kJ/mol  
24
22nd Energy Level
710.00 kJ/mol  
26
594.00 kJ/mol  
99+
23rd Energy Level
710.20 kJ/mol  
99+
5,346.00 kJ/mol  
26
24th Energy Level
710.20 kJ/mol  
25
565.50 kJ/mol  
99+
25th Energy Level
710.00 kJ/mol  
26
534.40 kJ/mol  
99+
26th Energy Level
710.20 kJ/mol  
25
565.50 kJ/mol  
99+
27th Energy Level
710.20 kJ/mol  
25
565.50 kJ/mol  
99+
28th Energy Level
710.20 kJ/mol  
30
565.50 kJ/mol  
99+
29th Energy Level
710.20 kJ/mol  
31
565.50 kJ/mol  
99+
30th Energy Level
710.00 kJ/mol  
25
594.00 kJ/mol  
99+
Electrochemical Equivalent
1.26 g/amp-hr  
99+
1.74 g/amp-hr  
99+
Electron Work Function
4.71 eV  
14
2.84 eV  
99+
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
44  
99+
58  
99+
Electron Configuration
[Kr] 4d7 5s1  
[Xe] 4f1 5d1 6s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Double Hexagonal Close Packed (DHCP)  
Crystal Lattice
rystal-Structure-of-Ruthenium.jpg#100  
DHCP-Crystal-Structure-of-Cerium.jpg#100  
Atom
  
  
Number of Protons
44  
99+
58  
99+
Number of Neutrons
57  
99+
82  
99+
Number of Electrons
44  
99+
58  
99+
Radius of an Atom
  
  
Atomic Radius
134.00 pm  
99+
181.80 pm  
14
Covalent Radius
146.00 pm  
40
204.00 pm  
8
Van der Waals Radius
200.00 pm  
35
235.00 pm  
21
Atomic Weight
101.07 amu  
99+
140.12 amu  
99+
Atomic Volume
8.30 cm3/mol  
99+
20.67 cm3/mol  
27
Adjacent Atomic Numbers
  
  
Previous Element
Technetium
  
Lanthanum
  
Next Element
Rhodium
  
Praseodymium
  
Valence Electron Potential
64.00 (-eV)  
22
41.78 (-eV)  
99+
Lattice Constant
270.59 pm  
99+
362.00 pm  
38
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.58  
33
1.59  
31
Mechanical
Density
  
  
Density At Room Temperature
12.45 g/cm3  
29
6.77 g/cm3  
99+
Density When Liquid (at m.p.)
10.65 g/cm3  
37
6.55 g/cm3  
99+
Tensile Strength
50.00 MPa  
38
270.00 MPa  
17
Viscosity
0.00  
25
0.00  
23
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
36
Vapor Pressure at 2000 K
0.00 (Pa)  
23
1.04 (Pa)  
13
Elasticity properties
  
  
Shear Modulus
173.00 GPa  
4
13.50 GPa  
99+
Bulk Modulus
220.00 GPa  
7
21.50 GPa  
99+
Young's Modulus
447.00 GPa  
3
33.60 GPa  
99+
Poisson Ratio
0.30  
14
0.24  
27
Other Mechanical Properties
Ductile, Malleable  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
12.45  
31
6.77  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
7
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
71.00 nΩ·m  
38
828.00 nΩ·m  
3
Electrical Conductivity
0.14 106/cm Ω  
18
0.01 106/cm Ω  
99+
Electron Affinity
101.30 kJ/mol  
11
50.00 kJ/mol  
26
Thermal
Specific Heat
0.24 J/(kg K)  
24
0.19 J/(kg K)  
33
Molar Heat Capacity
24.06 J/mol·K  
99+
26.94 J/mol·K  
30
Thermal Conductivity
117.00 W/m·K  
13
11.30 W/m·K  
99+
Critical Temperature
2,607.00 K  
9
1,071.00 K  
99+
Thermal Expansion
6.40 µm/(m·K)  
99+
6.30 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
567.80 kJ/mol  
13
414.00 kJ/mol  
22
Enthalpy of Fusion
25.50 kJ/mol  
7
5.46 kJ/mol  
99+
Enthalpy of Atomization
603.00 kJ/mol  
10
381.00 kJ/mol  
31
Standard Molar Entropy
28.50 J/mol.K  
99+
72.00 J/mol.K  
12
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