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Nobelium vs Actinium

Nobelium
Actinium
Actinium vs Nobelium


Periodic Table
Symbol
No  
Ac  
Group Number
3  
15
3  
15
Period Number
7  
7  
Block
f block  
f block  
Element Family
Actinide  
Actinide  
CAS Number
10028145  
16
7440348  
99+
Space Group Name
-  
Fm_ 3m  
Space Group Number
194.00  
7
225.00  
3
Facts
Interesting Facts
  • The most stable isotope of Nobelium metal is No-259.
  • No-259 has a half-life of fifty-eight minutes.
  
Actinium glows in the dark due to its radioactivity.  
Sources
Bombarding Curium-246 or Curium-249 with Carbon-12 Nuclei, Found in Minerals, Mining  
Obtained by Treating Radium with Neutrons, Ores of metals  
History
  
  
Who Discovered
Joint Institute for Nuclear Research  
Friedrich Oskar Giesel  
Discovery
In 1966  
In 1902  
Abundance
  
  
Abundance In Universe
-  
0.00 %  
34
Abundance In Sun
-  
0.00 %  
26
Abundance In Meteorites
-  
0.00 %  
99+
Abundance In Earth's Crust
-  
0.00 %  
99+
Abundance In Oceans
-  
0.00 %  
99+
Abundance In Humans
-  
0.00 %  
24
Uses
Uses & Benefits
  • Currently known uses of Nobelium metal are limited to research purpose only.
  
  • Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
Research Purposes  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
-  
Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
827.00 °C  
99+
1,227.00 °C  
38
Boiling Point
2,600.00 °C  
99+
3,200.00 °C  
27
Appearance
  
  
Physical State
Solid  
Solid  
Color
-  
Silvery White  
Luster
Unknown Luster  
-  
Hardness
  
  
Mohs Hardness
-  
6.50  
5
Brinell Hardness
500.00 MPa  
28
70.00 MPa  
99+
Vickers Hardness
500.00 MPa  
35
260.00 MPa  
99+
Speed of Sound
1,100.00 m/s  
99+
3,430.00 m/s  
32
Optical Properties
  
  
Refractive Index
1.30  
99+
1.00  
99+
Reflectivity
61.00 %  
22
62.00 %  
21
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
No  
Ac  
Isotopes
  
  
Known Isotopes
13  
26
29  
10
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.10  
99+
Sanderson Electronegativity
1.30  
25
1.10  
38
Allred Rochow Electronegativity
1.20  
28
1.00  
37
Mulliken-Jaffe Electronegativity
1.30  
33
1.10  
99+
Allen Electronegativity
1.10  
99+
1.10  
99+
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.90  
10
Ionization Energies
  
  
1st Energy Level
642.00 kJ/mol  
99+
499.00 kJ/mol  
99+
2nd Energy Level
1,254.00 kJ/mol  
99+
1,170.00 kJ/mol  
99+
3rd Energy Level
2,643.00 kJ/mol  
99+
1,900.00 kJ/mol  
99+
4th Energy Level
3,956.00 kJ/mol  
99+
4,700.00 kJ/mol  
33
5th Energy Level
6,400.00 kJ/mol  
35
4,990.00 kJ/mol  
99+
6th Energy Level
6,400.00 kJ/mol  
99+
5,750.00 kJ/mol  
99+
7th Energy level
6,270.00 kJ/mol  
99+
5,750.00 kJ/mol  
99+
8th Energy Level
6,270.00 kJ/mol  
99+
5,750.00 kJ/mol  
99+
9th Energy Level
6,270.00 kJ/mol  
99+
4,990.00 kJ/mol  
99+
10th Energy Level
6,270.00 kJ/mol  
99+
4,990.00 kJ/mol  
99+
11th Energy Level
6,420.00 kJ/mol  
99+
4,990.00 kJ/mol  
99+
12th Energy Level
64,000.00 kJ/mol  
8
49,900.00 kJ/mol  
21
13th Energy Level
6,400.00 kJ/mol  
36
4,990.00 kJ/mol  
99+
14th Energy Level
6,400.00 kJ/mol  
26
4,990.00 kJ/mol  
99+
15th Energy Level
64,000.00 kJ/mol  
36
49,900.00 kJ/mol  
99+
16th Energy Level
64,000.00 kJ/mol  
27
49,900.00 kJ/mol  
99+
17th Energy Level
641.00 kJ/mol  
99+
499.00 kJ/mol  
99+
18th Energy Level
3,500.00 kJ/mol  
99+
4,990.00 kJ/mol  
99+
19th Energy Level
627.60 kJ/mol  
99+
499.00 kJ/mol  
99+
20th Energy Level
627.00 kJ/mol  
99+
499.00 kJ/mol  
99+
21st Energy Level
917.00 kJ/mol  
34
4,990.00 kJ/mol  
25
22nd Energy Level
627.00 kJ/mol  
36
499.00 kJ/mol  
99+
23rd Energy Level
6,410.00 kJ/mol  
12
4,990.00 kJ/mol  
29
24th Energy Level
627.00 kJ/mol  
39
499.00 kJ/mol  
99+
25th Energy Level
0.00 kJ/mol  
99+
499.00 kJ/mol  
99+
26th Energy Level
601.20 kJ/mol  
99+
499.00 kJ/mol  
99+
27th Energy Level
641.00 kJ/mol  
37
499.00 kJ/mol  
99+
28th Energy Level
641.60 kJ/mol  
99+
499.00 kJ/mol  
99+
29th Energy Level
641.00 kJ/mol  
99+
499.00 kJ/mol  
99+
30th Energy Level
627.00 kJ/mol  
99+
499.00 kJ/mol  
99+
Electrochemical Equivalent
4.83 g/amp-hr  
4
2.82 g/amp-hr  
22
Electron Work Function
4.90 eV  
12
4.38 eV  
23
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
102  
16
89  
29
Electron Configuration
[Rn] 5f14 7s2  
[Rn] 6d1 7s2  
Crystal Structure
Not Known  
Face Centered Cubic (FCC)  
Crystal Lattice
Unknown-Crystal-Structure-of-Nobelium.jpg#100  
FCC-Crystal-Structure-of-Actinium.jpg#100  
Atom
  
  
Number of Protons
102  
16
89  
29
Number of Neutrons
157  
8
138  
17
Number of Electrons
102  
16
89  
29
Radius of an Atom
  
  
Atomic Radius
176.00 pm  
20
195.00 pm  
9
Covalent Radius
157.00 pm  
33
186.00 pm  
21
Van der Waals Radius
246.00 pm  
12
215.00 pm  
31
Atomic Weight
259.00 amu  
13
227.00 amu  
25
Atomic Volume
19.80 cm3/mol  
33
22.54 cm3/mol  
20
Adjacent Atomic Numbers
  
  
Previous Element
Mendelevium
  
Radium
  
Next Element
Lawrencium
  
Thorium
  
Valence Electron Potential
26.00 (-eV)  
99+
38.60 (-eV)  
99+
Lattice Constant
-  
567.00 pm  
9
Lattice Angles
-  
π/2, π/2, π/2  
Lattice C/A Ratio
1.76  
5
1.89  
2
Mechanical
Density
  
  
Density At Room Temperature
9.90 g/cm3  
99+
10.00 g/cm3  
40
Density When Liquid (at m.p.)
9.90 g/cm3  
99+
10.07 g/cm3  
40
Tensile Strength
80.00 MPa  
29
65.00 MPa  
33
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
28
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
27.00 GPa  
34
25.00 GPa  
38
Bulk Modulus
8.70 GPa  
99+
94.00 GPa  
17
Young's Modulus
12.30 GPa  
99+
130.00 GPa  
16
Poisson Ratio
0.30  
14
0.34  
10
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
9.90  
99+
10.07  
99+
Magnetic Ordering
-  
Paramagnetic  
Permeability
0.00 H/m  
3
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
0.68 nΩ·m  
99+
5.20 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.15 106/cm Ω  
13
Electron Affinity
50.00 kJ/mol  
26
33.20 kJ/mol  
34
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.12 J/(kg K)  
99+
Molar Heat Capacity
27.00 J/mol·K  
29
27.20 J/mol·K  
24
Thermal Conductivity
0.10 W/m·K  
99+
12.00 W/m·K  
99+
Critical Temperature
1,100.00 K  
99+
1,323.00 K  
99+
Thermal Expansion
11.00 µm/(m·K)  
99+
12.10 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
-  
120.00 kJ/mol  
99+
Enthalpy of Fusion
-  
14.20 kJ/mol  
28
Enthalpy of Atomization
390.40 kJ/mol  
30
301.00 kJ/mol  
99+
Standard Molar Entropy
63.00 J/mol.K  
24
56.50 J/mol.K  
33
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