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Actinium vs Nobelium

Actinium
Nobelium
Nobelium vs Actinium


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