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Chromium vs 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   
Unknown   

CAS Number
7440473   
39
54386242   
1

Space Group Name
Im_ 3m   
Not Available   

Space Group Number
229.00   
1
194.00   
5

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.
  
Not Available   

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
1.5 * 10-3 %   
7
Not Available   

Abundance In Sun
~0.002 %   
7
~-9999 %   

Abundance In Meteorites
0.30 %   
7
Not Available   

Abundance In Earth's Crust
0.01 %   
13
Not Available   

Abundance In Oceans
0.00 %   
16
Not Available   

Abundance In Humans
0.00 %   
16
Not Available   

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   
NA   

Medical Uses
NA   
NA   

Other Uses
Alloys   
Research Purposes   

Biological Properties
  
  

Toxicity
Highly Toxic   
Unknown   

Present in Human Body
Yes   
No   

In Blood
0.11 Blood/mg dm-3   
12
0.00 Blood/mg dm-3   
37

In Bone
0.33 p.p.m.   
21
0.00 p.p.m.   
36

Physical Properties

Melting Point
1,857.00 °C   
14
Not Available   

Boiling Point
2,672.00 °C   
39
Not Available   

Appearance
  
  

Physical State
Solid   
Solid   

Color
Silver   
Silver   

Luster
Metallic   
Unknown Luster   

Hardness
  
  

Mohs Hardness
8.50   
1
Not Available   

Brinell Hardness
687.00 MPa   
16
Not Available   

Vickers Hardness
1,060.00 MPa   
10
Not Available   

Speed of Sound
5,940.00 m/s   
5
Not Available   

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
Cr   
Rg   

Isotopes
  
  

Known Isotopes
21   
18
1   
34

Electronegativity
  
  

Pauling Electronegativity
1.66   
18
Not Available   

Sanderson Electronegativity
1.66   
14
Not Available   

Allred Rochow Electronegativity
1.56   
10
Not Available   

Allen Electronegativity
1.65   
19
Not Available   

Electropositivity
  
  

Pauling Electropositivity
2.34   
36
Not Available   

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   
36

5th Energy Level
97,510.00 kJ/mol   
1
5,306.70 kJ/mol   
31

6th Energy Level
105,800.00 kJ/mol   
1
Not Available   

7th Energy level
114,300.00 kJ/mol   
1
Not Available   

8th Energy Level
125,300.00 kJ/mol   
1
Not Available   

9th Energy Level
134,700.00 kJ/mol   
1
Not Available   

10th Energy Level
144,300.00 kJ/mol   
1
Not Available   

11th Energy Level
26,130.00 kJ/mol   
12
Not Available   

12th Energy Level
28,750.00 kJ/mol   
13
Not Available   

13th Energy Level
34,230.00 kJ/mol   
10
Not Available   

14th Energy Level
37,066.00 kJ/mol   
12
Not Available   

15th Energy Level
97,510.00 kJ/mol   
1
Not Available   

16th Energy Level
105,800.00 kJ/mol   
2
Not Available   

17th Energy Level
114,300.00 kJ/mol   
3
Not Available   

18th Energy Level
125,300.00 kJ/mol   
4
Not Available   

19th Energy Level
134,700.00 kJ/mol   
5
Not Available   

20th Energy Level
144,300.00 kJ/mol   
7
Not Available   

21st Energy Level
157,700.00 kJ/mol   
7
Not Available   

22nd Energy Level
166,090.00 kJ/mol   
6
Not Available   

Electrochemical Equivalent
0.32 g/amp-hr   
99+
Not Available   

Electron Work Function
4.50 eV   
14
Not Available   

Other Chemical Properties
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility   
NA   

Atomic Properties

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   
3

Number of Electrons
24   
99+
111   
7

Radius of an Atom
  
  

Atomic Radius
128.00 pm   
99+
Not Available   

Covalent Radius
139.00 pm   
99+
Not Available   

Van der Waals Radius
200.00 pm   
28
Not Available   

Atomic Weight
52.00 amu   
99+
281.00 amu   
6

Atomic Volume
7.23 cm3/mol   
99+
Not Available   

Adjacent Atomic Numbers
  
  

Previous Element
Vanadium
  

Next Element
Manganese
  

Valence Electron Potential
170.00 (-eV)   
4
Not Available   

Lattice Constant
291.00 pm   
99+
Not Available   

Lattice Angles
π/2, π/2, π/2   
NA   

Lattice C/A Ratio
Not Available   
Not Available   

Mechanical Properties

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   
40
Not Available   

Tensile Strength
689.00 MPa   
7
Not Available   

Viscosity
Not Available   
Not Available   

Vapor Pressure
  
  

Vapor Pressure at 1000 K
0.00 (Pa)   
24
Not Available   

Vapor Pressure at 2000 K
774.00 (Pa)   
1
Not Available   

Elasticity properties
  
  

Shear Modulus
115.00 GPa   
9
Not Available   

Bulk Modulus
160.00 GPa   
11
Not Available   

Young's Modulus
279.00 GPa   
8
Not Available   

Poisson Ratio
0.21   
32
Not Available   

Other Mechanical Properties
NA   
Unknown   

Magnetic Properties

Magnetic Characteristics
  
  

Specific Gravity
7.19   
99+
Not Available   

Magnetic Ordering
Antiferromagnetic   
Unknown   

Electrical Properties
  
  

Electrical Property
NA   
Unknown   

Resistivity
125.00 nΩ·m   
27
Not Available   

Electrical Conductivity
0.08 106/cm Ω   
25
Not Available   

Electron Affinity
64.30 kJ/mol   
15
Not Available   

Thermal Properties

Specific Heat
0.45 J/(kg K)   
12
Not Available   

Molar Heat Capacity
23.35 J/mol·K   
99+
Not Available   

Thermal Conductivity
93.90 W/m·K   
17
Not Available   

Critical Temperature
Not Available   
Not Available   

Thermal Expansion
4.90 µm/(m·K)   
99+
Not Available   

Enthalpy
  
  

Enthalpy of Vaporization
348.80 kJ/mol   
24
Not Available   

Enthalpy of Fusion
15.31 kJ/mol   
20
Not Available   

Enthalpy of Atomization
397.50 kJ/mol   
21
Not Available   

Standard Molar Entropy
23.80 J/mol.K   
99+
Not Available   

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