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Chromium vs Roentgenium

Chromium
Roentgenium
Roentgenium vs Chromium


Periodic Table
Symbol
Cr  
Rg  
Group Number
6  
12
11  
7
Period Number
4  
7  
Block
d block  
d block  
Element Family
Transition Metal  
-  
CAS Number
7440473  
39
54386242  
1
Space Group Name
Im_ 3m  
-  
Space Group Number
229.00  
2
194.00  
7
Facts
Interesting Facts
  • Chromium is highly reactive, hence it is not found free in nature.
  • Ores of Chromites mineral are the major source of Chromium metal.
  • Almost 90% leather tanning is done with the help of chromium.
  
Roentgenium is a highly unstable synthetic element.  
Sources
Found in Minerals, Mining, Ores of metals, Ores of Minerals  
Synthetically Produced  
History
  
  
Who Discovered
Louis Nicolas Vauquelin  
Gesellschaft für Schwerionenforschung  
Discovery
In Between 1797 - 1798  
In 1994  
Abundance
  
  
Abundance In Universe
0.00 %  
8
0.00 %  
40
Abundance In Sun
0.00 %  
7
-  
Abundance In Meteorites
0.30 %  
7
-  
Abundance In Earth's Crust
0.01 %  
13
-  
Abundance In Oceans
0.00 %  
16
-  
Abundance In Humans
0.00 %  
19
-  
Uses
Uses & Benefits
  • It is used to harden the steel and produces a stainless steel and other various alloys.
  • It is also used to give proper finish to polished mirrors. Its chromium plates are used in bathroom fittings.
  
  • Currently known uses of Roentgenium metal are limited to research purpose only.
  
Industrial Uses
Automobile Industry, Chemical Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
Research Purposes  
Biological Properties
  
  
Toxicity
Highly Toxic  
-  
Present in Human Body
Yes  
No  
In Blood
0.11 Blood/mg dm-3  
12
0.00 Blood/mg dm-3  
40
In Bone
0.33 p.p.m.  
25
0.00 p.p.m.  
99+
Physical
Melting Point
1,857.00 °C  
14
-  
Boiling Point
2,672.00 °C  
99+
2,800.00 °C  
38
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Silver  
Luster
Metallic  
Unknown Luster  
Hardness
  
  
Mohs Hardness
8.50  
1
-  
Brinell Hardness
687.00 MPa  
18
700.00 MPa  
17
Vickers Hardness
1,060.00 MPa  
17
450.00 MPa  
38
Speed of Sound
5,940.00 m/s  
8
3,430.00 m/s  
32
Optical Properties
  
  
Refractive Index
2.97  
2
1.30  
99+
Reflectivity
70.00 %  
13
64.00 %  
19
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Cr  
Rg  
Isotopes
  
  
Known Isotopes
21  
18
1  
34
Electronegativity
  
  
Pauling Electronegativity
1.66  
19
0.00  
99+
Sanderson Electronegativity
1.66  
17
1.90  
13
Allred Rochow Electronegativity
1.56  
11
1.30  
25
Mulliken-Jaffe Electronegativity
1.66  
19
0.90  
99+
Allen Electronegativity
1.65  
22
0.80  
99+
Electropositivity
  
  
Pauling Electropositivity
2.34  
36
2.20  
39
Ionization Energies
  
  
1st Energy Level
26,130.00 kJ/mol  
1
1,022.70 kJ/mol  
3
2nd Energy Level
28,750.00 kJ/mol  
1
2,074.40 kJ/mol  
10
3rd Energy Level
34,230.00 kJ/mol  
1
3,077.90 kJ/mol  
24
4th Energy Level
37,066.00 kJ/mol  
1
4,052.40 kJ/mol  
99+
5th Energy Level
97,510.00 kJ/mol  
1
5,306.70 kJ/mol  
99+
6th Energy Level
105,800.00 kJ/mol  
1
11,100.00 kJ/mol  
10
7th Energy level
114,300.00 kJ/mol  
1
5,800.00 kJ/mol  
99+
8th Energy Level
125,300.00 kJ/mol  
1
5,800.00 kJ/mol  
99+
9th Energy Level
134,700.00 kJ/mol  
1
5,650.00 kJ/mol  
99+
10th Energy Level
144,300.00 kJ/mol  
1
5,800.00 kJ/mol  
99+
11th Energy Level
26,130.00 kJ/mol  
12
8,300.00 kJ/mol  
24
12th Energy Level
28,750.00 kJ/mol  
36
8,300.00 kJ/mol  
99+
13th Energy Level
34,230.00 kJ/mol  
10
8,700.00 kJ/mol  
16
14th Energy Level
37,066.00 kJ/mol  
12
8,300.00 kJ/mol  
16
15th Energy Level
97,510.00 kJ/mol  
2
87,000.00 kJ/mol  
9
16th Energy Level
105,800.00 kJ/mol  
2
83,000.00 kJ/mol  
11
17th Energy Level
114,300.00 kJ/mol  
3
830.80 kJ/mol  
30
18th Energy Level
125,300.00 kJ/mol  
4
8,300.00 kJ/mol  
19
19th Energy Level
134,700.00 kJ/mol  
5
580.00 kJ/mol  
99+
20th Energy Level
144,300.00 kJ/mol  
7
580.00 kJ/mol  
99+
21st Energy Level
157,700.00 kJ/mol  
7
5,800.00 kJ/mol  
21
22nd Energy Level
166,090.00 kJ/mol  
6
580.00 kJ/mol  
99+
23rd Energy Level
653.80 kJ/mol  
99+
5,800.00 kJ/mol  
21
24th Energy Level
653.80 kJ/mol  
32
538.70 kJ/mol  
99+
25th Energy Level
653.80 kJ/mol  
34
0.00 kJ/mol  
99+
26th Energy Level
653.80 kJ/mol  
33
580.00 kJ/mol  
99+
27th Energy Level
652.90 kJ/mol  
34
580.00 kJ/mol  
99+
28th Energy Level
653.80 kJ/mol  
39
880.00 kJ/mol  
8
29th Energy Level
653.80 kJ/mol  
40
580.00 kJ/mol  
99+
30th Energy Level
653.80 kJ/mol  
36
0.00 kJ/mol  
99+
Electrochemical Equivalent
0.32 g/amp-hr  
99+
3.10 g/amp-hr  
18
Electron Work Function
4.50 eV  
19
4.90 eV  
12
Other Chemical Properties
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility  
-  
Atomic
Atomic Number
24  
99+
111  
7
Electron Configuration
[Ar] 3d5 4s1  
[Rn] 5f14 6d9 7s2  
Crystal Structure
Body Centered Cubic (BCC)  
Body Centered Cubic (BCC)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
24  
99+
111  
7
Number of Neutrons
28  
99+
161  
4
Number of Electrons
24  
99+
111  
7
Radius of an Atom
  
  
Atomic Radius
128.00 pm  
99+
200.00 pm  
7
Covalent Radius
139.00 pm  
99+
126.00 pm  
99+
Van der Waals Radius
200.00 pm  
35
280.00 pm  
6
Atomic Weight
52.00 amu  
99+
281.00 amu  
6
Atomic Volume
7.23 cm3/mol  
99+
28.70 cm3/mol  
12
Adjacent Atomic Numbers
  
  
Previous Element
Vanadium
  
Darmstadtium
  
Next Element
Manganese
  
Copernicium
  
Valence Electron Potential
170.00 (-eV)  
4
11.90 (-eV)  
99+
Lattice Constant
291.00 pm  
99+
0.00 pm  
99+
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.86  
4
1.90  
1
Mechanical
Density
  
  
Density At Room Temperature
7.19 g/cm3  
99+
28.70 g/cm3  
6
Density When Liquid (at m.p.)
6.30 g/cm3  
99+
28.70 g/cm3  
7
Tensile Strength
689.00 MPa  
7
65.00 MPa  
33
Viscosity
0.00  
23
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
26
0.00 (Pa)  
37
Vapor Pressure at 2000 K
774.00 (Pa)  
1
0.00 (Pa)  
99+
Elasticity properties
  
  
Shear Modulus
115.00 GPa  
9
26.00 GPa  
36
Bulk Modulus
160.00 GPa  
11
0.00 GPa  
99+
Young's Modulus
279.00 GPa  
8
12.70 GPa  
99+
Poisson Ratio
0.21  
33
0.30  
14
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
7.19  
99+
28.70  
8
Magnetic Ordering
Antiferromagnetic  
-  
Permeability
0.00 H/m  
17
0.00 H/m  
12
Susceptibility
0.00  
10
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
125.00 nΩ·m  
27
0.20 nΩ·m  
99+
Electrical Conductivity
0.08 106/cm Ω  
30
0.00 106/cm Ω  
99+
Electron Affinity
64.30 kJ/mol  
17
50.00 kJ/mol  
26
Thermal
Specific Heat
0.45 J/(kg K)  
12
0.13 J/(kg K)  
40
Molar Heat Capacity
23.35 J/mol·K  
99+
23.70 J/mol·K  
99+
Thermal Conductivity
93.90 W/m·K  
17
0.10 W/m·K  
99+
Critical Temperature
1,907.00 K  
24
1,100.00 K  
99+
Thermal Expansion
4.90 µm/(m·K)  
99+
12.60 µm/(m·K)  
40
Enthalpy
  
  
Enthalpy of Vaporization
348.80 kJ/mol  
35
580.00 kJ/mol  
12
Enthalpy of Fusion
15.31 kJ/mol  
20
-  
Enthalpy of Atomization
397.50 kJ/mol  
27
580.00 kJ/mol  
14
Standard Molar Entropy
23.80 J/mol.K  
99+
57.00 J/mol.K  
30
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