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Radium vs Roentgenium

Radium
Roentgenium
Roentgenium vs Radium


Periodic Table
Symbol
Ra  
Rg  
Group Number
2  
16
11  
7
Period Number
7  
7  
Block
s block  
d block  
Element Family
Alkaline Earth  
-  
CAS Number
7440144  
99+
54386242  
1
Space Group Name
Im_ 3m  
-  
Space Group Number
229.00  
2
194.00  
7
Facts
Interesting Facts
  • Radium metal is the heaviest metal of Alkaline earth metals column.
  • Radium metal is highly radioactive and does not have any stable isotopes.
  
Roentgenium is a highly unstable synthetic element.  
Sources
Mining, Ores of metals  
Synthetically Produced  
History
  
  
Who Discovered
-  
Gesellschaft für Schwerionenforschung  
Discovery
In 1898  
In 1994  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
40
Abundance In Sun
0.00 %  
26
-  
Abundance In Meteorites
-  
-  
Abundance In Earth's Crust
0.00 %  
99+
-  
Abundance In Oceans
0.00 %  
99+
-  
Abundance In Humans
0.00 %  
23
-  
Uses
Uses & Benefits
  • It is a highly radioactive metal; and sometime Radium-223 is used to treat prostate cancer.
  • It is used in luminous paints.
  
  • Currently known uses of Roentgenium metal are limited to research purpose only.
  
Industrial Uses
-  
-  
Medical Uses
Pharmaceutical Industry  
-  
Other Uses
-  
Research Purposes  
Biological Properties
  
  
Toxicity
Highly Toxic  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
34
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
700.00 °C  
99+
-  
Boiling Point
1,737.00 °C  
99+
2,800.00 °C  
38
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silver  
Luster
Metallic  
Unknown Luster  
Hardness
  
  
Mohs Hardness
1.00  
22
-  
Brinell Hardness
700.00 MPa  
17
700.00 MPa  
17
Vickers Hardness
140.00 MPa  
99+
450.00 MPa  
38
Speed of Sound
3,150.00 m/s  
37
3,430.00 m/s  
32
Optical Properties
  
  
Refractive Index
1.00  
99+
1.30  
99+
Reflectivity
83.00 %  
6
64.00 %  
19
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ra  
Rg  
Isotopes
  
  
Known Isotopes
33  
6
1  
34
Electronegativity
  
  
Pauling Electronegativity
0.90  
99+
0.00  
99+
Sanderson Electronegativity
0.89  
99+
1.90  
13
Allred Rochow Electronegativity
0.97  
39
1.30  
25
Mulliken-Jaffe Electronegativity
0.92  
99+
0.90  
99+
Allen Electronegativity
0.89  
99+
0.80  
99+
Electropositivity
  
  
Pauling Electropositivity
3.10  
5
2.20  
39
Ionization Energies
  
  
1st Energy Level
509.30 kJ/mol  
99+
1,022.70 kJ/mol  
3
2nd Energy Level
979.00 kJ/mol  
99+
2,074.40 kJ/mol  
10
3rd Energy Level
509.30 kJ/mol  
99+
3,077.90 kJ/mol  
24
4th Energy Level
5,093.00 kJ/mol  
27
4,052.40 kJ/mol  
99+
5th Energy Level
5,090.00 kJ/mol  
99+
5,306.70 kJ/mol  
99+
6th Energy Level
5,090.00 kJ/mol  
99+
11,100.00 kJ/mol  
10
7th Energy level
5,090.00 kJ/mol  
99+
5,800.00 kJ/mol  
99+
8th Energy Level
5,090.00 kJ/mol  
99+
5,800.00 kJ/mol  
99+
9th Energy Level
5,090.00 kJ/mol  
99+
5,650.00 kJ/mol  
99+
10th Energy Level
5,090.00 kJ/mol  
99+
5,800.00 kJ/mol  
99+
11th Energy Level
5,090.00 kJ/mol  
99+
8,300.00 kJ/mol  
24
12th Energy Level
5,090.00 kJ/mol  
99+
8,300.00 kJ/mol  
99+
13th Energy Level
5,090.00 kJ/mol  
99+
8,700.00 kJ/mol  
16
14th Energy Level
5,090.00 kJ/mol  
99+
8,300.00 kJ/mol  
16
15th Energy Level
50,900.00 kJ/mol  
99+
87,000.00 kJ/mol  
9
16th Energy Level
50,900.00 kJ/mol  
99+
83,000.00 kJ/mol  
11
17th Energy Level
509.30 kJ/mol  
99+
830.80 kJ/mol  
30
18th Energy Level
5,090.00 kJ/mol  
99+
8,300.00 kJ/mol  
19
19th Energy Level
509.30 kJ/mol  
99+
580.00 kJ/mol  
99+
20th Energy Level
509.00 kJ/mol  
99+
580.00 kJ/mol  
99+
21st Energy Level
509.30 kJ/mol  
99+
5,800.00 kJ/mol  
21
22nd Energy Level
509.00 kJ/mol  
99+
580.00 kJ/mol  
99+
23rd Energy Level
509.30 kJ/mol  
99+
5,800.00 kJ/mol  
21
24th Energy Level
509.30 kJ/mol  
99+
538.70 kJ/mol  
99+
25th Energy Level
509.00 kJ/mol  
99+
0.00 kJ/mol  
99+
26th Energy Level
509.30 kJ/mol  
99+
580.00 kJ/mol  
99+
27th Energy Level
509.30 kJ/mol  
99+
580.00 kJ/mol  
99+
28th Energy Level
509.30 kJ/mol  
99+
880.00 kJ/mol  
8
29th Energy Level
509.30 kJ/mol  
99+
580.00 kJ/mol  
99+
30th Energy Level
509.00 kJ/mol  
99+
0.00 kJ/mol  
99+
Electrochemical Equivalent
4.22 g/amp-hr  
6
3.10 g/amp-hr  
18
Electron Work Function
4.30 eV  
25
4.90 eV  
12
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
-  
Atomic
Atomic Number
88  
30
111  
7
Electron Configuration
[Rn] 7s2  
[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
88  
30
111  
7
Number of Neutrons
138  
17
161  
4
Number of Electrons
88  
30
111  
7
Radius of an Atom
  
  
Atomic Radius
215.00 pm  
6
200.00 pm  
7
Covalent Radius
221.00 pm  
3
126.00 pm  
99+
Van der Waals Radius
283.00 pm  
5
280.00 pm  
6
Atomic Weight
226.00 amu  
26
281.00 amu  
6
Atomic Volume
45.20 cm3/mol  
5
28.70 cm3/mol  
12
Adjacent Atomic Numbers
  
  
Previous Element
Francium
  
Darmstadtium
  
Next Element
Actinium
  
Copernicium
  
Valence Electron Potential
20.10 (-eV)  
99+
11.90 (-eV)  
99+
Lattice Constant
514.80 pm  
15
0.00 pm  
99+
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.57  
99+
1.90  
1
Mechanical
Density
  
  
Density At Room Temperature
5.50 g/cm3  
99+
28.70 g/cm3  
6
Density When Liquid (at m.p.)
5.50 g/cm3  
99+
28.70 g/cm3  
7
Tensile Strength
40.00 MPa  
99+
65.00 MPa  
33
Viscosity
0.00  
2
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
16
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
33
0.00 (Pa)  
99+
Elasticity properties
  
  
Shear Modulus
25.00 GPa  
38
26.00 GPa  
36
Bulk Modulus
43.00 GPa  
33
0.00 GPa  
99+
Young's Modulus
83.00 GPa  
25
12.70 GPa  
99+
Poisson Ratio
0.31  
13
0.30  
14
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
5.00  
99+
28.70  
8
Magnetic Ordering
Nonmagnetic  
-  
Permeability
0.00 H/m  
9
0.00 H/m  
12
Susceptibility
0.00  
18
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
100.00 nΩ·m  
31
0.20 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
0.90 kJ/mol  
99+
50.00 kJ/mol  
26
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.13 J/(kg K)  
40
Molar Heat Capacity
20.05 J/mol·K  
99+
23.70 J/mol·K  
99+
Thermal Conductivity
18.60 W/m·K  
99+
0.10 W/m·K  
99+
Critical Temperature
973.00 K  
99+
1,100.00 K  
99+
Thermal Expansion
8.50 µm/(m·K)  
99+
12.60 µm/(m·K)  
40
Enthalpy
  
  
Enthalpy of Vaporization
113.00 kJ/mol  
99+
580.00 kJ/mol  
12
Enthalpy of Fusion
8.60 kJ/mol  
99+
-  
Enthalpy of Atomization
163.00 kJ/mol  
99+
580.00 kJ/mol  
14
Standard Molar Entropy
71.00 J/mol.K  
14
57.00 J/mol.K  
30
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