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Roentgenium vs Scandium

Roentgenium
Scandium
Scandium vs Roentgenium


Periodic Table
Symbol
Rg  
Sc  
Group Number
11  
7
3  
15
Period Number
7  
4  
Block
d block  
d block  
Element Family
-  
Transition Metal  
CAS Number
54386242  
1
7440202  
99+
Space Group Name
-  
P63/mmc  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
Roentgenium is a highly unstable synthetic element.  
  • Scandium is known as one of the rare earth elements.
  • Scandium metal found in rare minerals called Wolframite .
  
Sources
Synthetically Produced  
Found in Minerals, Mining, Ores of metals, Ores of Minerals  
History
  
  
Who Discovered
Gesellschaft für Schwerionenforschung  
Lars Fredrik Nilson  
Discovery
In 1994  
In 1879  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
16
Abundance In Sun
-  
0.00 %  
16
Abundance In Meteorites
-  
0.00 %  
18
Abundance In Earth's Crust
-  
0.00 %  
23
Abundance In Oceans
-  
0.00 %  
32
Abundance In Humans
-  
0.00 %  
24
Uses
Uses & Benefits
  • Currently known uses of Roentgenium metal are limited to research purpose only.
  
  • Uses of Scandium are limited to research purpose only. However, it has very low density and higher melting point.
  • Its compounds like scandium iodide is used in mercury vapor lamps to produce very bright white light.
  
Industrial Uses
-  
Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Research Purposes  
Alloys  
Biological Properties
  
  
Toxicity
-  
Non Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
40
0.01 Blood/mg dm-3  
22
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
39
Physical
Melting Point
-  
1,539.00 °C  
24
Boiling Point
2,800.00 °C  
38
2,832.00 °C  
36
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Silvery White  
Luster
Unknown Luster  
Lustrous  
Hardness
  
  
Mohs Hardness
-  
5.50  
7
Brinell Hardness
700.00 MPa  
17
750.00 MPa  
13
Vickers Hardness
450.00 MPa  
38
1,200.00 MPa  
13
Speed of Sound
3,430.00 m/s  
32
6,100.00 m/s  
5
Optical Properties
  
  
Refractive Index
1.30  
99+
1.80  
21
Reflectivity
64.00 %  
19
93.00 %  
3
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Rg  
Sc  
Isotopes
  
  
Known Isotopes
1  
34
13  
26
Electronegativity
  
  
Pauling Electronegativity
0.00  
99+
1.36  
30
Sanderson Electronegativity
1.90  
13
1.02  
40
Allred Rochow Electronegativity
1.30  
25
1.20  
28
Mulliken-Jaffe Electronegativity
0.90  
99+
1.36  
31
Allen Electronegativity
0.80  
99+
1.19  
99+
Electropositivity
  
  
Pauling Electropositivity
2.20  
39
2.64  
25
Ionization Energies
  
  
1st Energy Level
1,022.70 kJ/mol  
3
633.10 kJ/mol  
99+
2nd Energy Level
2,074.40 kJ/mol  
10
1,235.00 kJ/mol  
99+
3rd Energy Level
3,077.90 kJ/mol  
24
2,388.60 kJ/mol  
99+
4th Energy Level
4,052.40 kJ/mol  
99+
7,090.60 kJ/mol  
13
5th Energy Level
5,306.70 kJ/mol  
99+
8,843.00 kJ/mol  
7
6th Energy Level
11,100.00 kJ/mol  
10
10,679.00 kJ/mol  
13
7th Energy level
5,800.00 kJ/mol  
99+
13,310.00 kJ/mol  
8
8th Energy Level
5,800.00 kJ/mol  
99+
15,250.00 kJ/mol  
11
9th Energy Level
5,650.00 kJ/mol  
99+
17,370.00 kJ/mol  
14
10th Energy Level
5,800.00 kJ/mol  
99+
21,726.00 kJ/mol  
13
11th Energy Level
8,300.00 kJ/mol  
24
24,102.00 kJ/mol  
16
12th Energy Level
8,300.00 kJ/mol  
99+
66,320.00 kJ/mol  
7
13th Energy Level
8,700.00 kJ/mol  
16
73,010.00 kJ/mol  
2
14th Energy Level
8,300.00 kJ/mol  
16
80,160.00 kJ/mol  
3
15th Energy Level
87,000.00 kJ/mol  
9
89,490.00 kJ/mol  
6
16th Energy Level
83,000.00 kJ/mol  
11
97,400.00 kJ/mol  
5
17th Energy Level
830.80 kJ/mol  
30
105,600.00 kJ/mol  
6
18th Energy Level
8,300.00 kJ/mol  
19
117,000.00 kJ/mol  
7
19th Energy Level
580.00 kJ/mol  
99+
124,270.00 kJ/mol  
8
20th Energy Level
580.00 kJ/mol  
99+
633.00 kJ/mol  
99+
21st Energy Level
5,800.00 kJ/mol  
21
633.10 kJ/mol  
99+
22nd Energy Level
580.00 kJ/mol  
99+
633.00 kJ/mol  
35
23rd Energy Level
5,800.00 kJ/mol  
21
633.10 kJ/mol  
99+
24th Energy Level
538.70 kJ/mol  
99+
633.10 kJ/mol  
37
25th Energy Level
0.00 kJ/mol  
99+
633.00 kJ/mol  
39
26th Energy Level
580.00 kJ/mol  
99+
633.10 kJ/mol  
38
27th Energy Level
580.00 kJ/mol  
99+
633.10 kJ/mol  
40
28th Energy Level
880.00 kJ/mol  
8
633.10 kJ/mol  
99+
29th Energy Level
580.00 kJ/mol  
99+
633.10 kJ/mol  
99+
30th Energy Level
0.00 kJ/mol  
99+
633.00 kJ/mol  
99+
Electrochemical Equivalent
3.10 g/amp-hr  
18
0.56 g/amp-hr  
99+
Electron Work Function
4.90 eV  
12
3.50 eV  
99+
Other Chemical Properties
-  
Corrosion, Flammable, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
111  
7
21  
99+
Electron Configuration
[Rn] 5f14 6d9 7s2  
[Ar] 3d1 4s2  
Crystal Structure
Body Centered Cubic (BCC)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
HCP-Crystal-Structure-of-Scandium.jpg#100  
Atom
  
  
Number of Protons
111  
7
21  
99+
Number of Neutrons
161  
4
24  
99+
Number of Electrons
111  
7
21  
99+
Radius of an Atom
  
  
Atomic Radius
200.00 pm  
7
162.00 pm  
28
Covalent Radius
126.00 pm  
99+
170.00 pm  
27
Van der Waals Radius
280.00 pm  
6
211.00 pm  
32
Atomic Weight
281.00 amu  
6
44.96 amu  
99+
Atomic Volume
28.70 cm3/mol  
12
15.00 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Darmstadtium
  
Calcium
  
Next Element
Copernicium
  
Titanium
  
Valence Electron Potential
11.90 (-eV)  
99+
58.00 (-eV)  
25
Lattice Constant
0.00 pm  
99+
330.90 pm  
99+
Lattice Angles
-  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.90  
1
1.59  
24
Mechanical
Density
  
  
Density At Room Temperature
28.70 g/cm3  
6
2.99 g/cm3  
99+
Density When Liquid (at m.p.)
28.70 g/cm3  
7
2.80 g/cm3  
99+
Tensile Strength
65.00 MPa  
33
150.00 MPa  
25
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
24
Vapor Pressure at 2000 K
0.00 (Pa)  
99+
91.30 (Pa)  
3
Elasticity properties
  
  
Shear Modulus
26.00 GPa  
36
29.10 GPa  
28
Bulk Modulus
0.00 GPa  
99+
56.60 GPa  
22
Young's Modulus
12.70 GPa  
99+
74.40 GPa  
28
Poisson Ratio
0.30  
14
0.28  
18
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
28.70  
8
2.99  
99+
Magnetic Ordering
-  
Paramagnetic  
Permeability
0.00 H/m  
12
0.00 H/m  
8
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
0.20 nΩ·m  
99+
562.00 nΩ·m  
10
Electrical Conductivity
0.00 106/cm Ω  
99+
0.02 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
18.10 kJ/mol  
39
Thermal
Specific Heat
0.13 J/(kg K)  
40
0.60 J/(kg K)  
8
Molar Heat Capacity
23.70 J/mol·K  
99+
25.52 J/mol·K  
99+
Thermal Conductivity
0.10 W/m·K  
99+
15.80 W/m·K  
99+
Critical Temperature
1,100.00 K  
99+
1,814.00 K  
28
Thermal Expansion
12.60 µm/(m·K)  
40
10.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
580.00 kJ/mol  
12
314.20 kJ/mol  
99+
Enthalpy of Fusion
-  
14.10 kJ/mol  
29
Enthalpy of Atomization
580.00 kJ/mol  
14
343.00 kJ/mol  
38
Standard Molar Entropy
57.00 J/mol.K  
30
34.60 J/mol.K  
99+
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