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Actinium vs Lawrencium

Actinium
Lawrencium
Lawrencium vs Actinium


Periodic Table
Symbol
Ac  
Lr  
Group Number
3  
15
3  
15
Period Number
7  
7  
Block
f block  
d block  
Element Family
Actinide  
Actinide  
CAS Number
7440348  
99+
22537195  
15
Space Group Name
Fm_ 3m  
-  
Space Group Number
225.00  
3
225.00  
3
Facts
Interesting Facts
Actinium glows in the dark due to its radioactivity.  
  • It is synthetically produced metal.
  • Radiation hazard can be produce by it.
  
Sources
Obtained by Treating Radium with Neutrons, Ores of metals  
Bombarding Californium-252 with Boron Nuclei, Found in Minerals, Mining  
History
  
  
Who Discovered
Friedrich Oskar Giesel  
Lawrence Berkeley National Laboratory and Joint Institute for Nuclear Research  
Discovery
In 1902  
In 1961–1971  
Abundance
  
  
Abundance In Universe
0.00 %  
34
0.00 %  
40
Abundance In Sun
0.00 %  
26
-  
Abundance In Meteorites
0.00 %  
99+
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
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 Lawrencium metal are limited to research purpose only.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
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
1,227.00 °C  
38
1,627.00 °C  
20
Boiling Point
3,200.00 °C  
27
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silver  
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
2,760.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.00  
99+
1.30  
99+
Reflectivity
62.00 %  
21
65.00 %  
18
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ac  
Lr  
Isotopes
  
  
Known Isotopes
29  
10
10  
28
Electronegativity
  
  
Pauling Electronegativity
1.10  
99+
1.30  
33
Sanderson Electronegativity
1.10  
38
1.30  
25
Allred Rochow Electronegativity
1.00  
37
1.30  
25
Mulliken-Jaffe Electronegativity
1.10  
99+
1.30  
33
Allen Electronegativity
1.10  
99+
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.90  
10
2.00  
99+
Ionization Energies
  
  
1st Energy Level
499.00 kJ/mol  
99+
470.00 kJ/mol  
99+
2nd Energy Level
1,170.00 kJ/mol  
99+
1,428.00 kJ/mol  
99+
3rd Energy Level
1,900.00 kJ/mol  
99+
2,228.00 kJ/mol  
99+
4th Energy Level
4,700.00 kJ/mol  
33
4,910.00 kJ/mol  
31
5th Energy Level
4,990.00 kJ/mol  
99+
4,780.00 kJ/mol  
99+
6th Energy Level
5,750.00 kJ/mol  
99+
4,780.00 kJ/mol  
99+
7th Energy level
5,750.00 kJ/mol  
99+
4,780.00 kJ/mol  
99+
8th Energy Level
5,750.00 kJ/mol  
99+
4,780.00 kJ/mol  
99+
9th Energy Level
4,990.00 kJ/mol  
99+
4,780.00 kJ/mol  
99+
10th Energy Level
4,990.00 kJ/mol  
99+
5,800.00 kJ/mol  
99+
11th Energy Level
4,990.00 kJ/mol  
99+
5,800.00 kJ/mol  
99+
12th Energy Level
49,900.00 kJ/mol  
21
47,800.00 kJ/mol  
22
13th Energy Level
4,990.00 kJ/mol  
99+
4,780.00 kJ/mol  
99+
14th Energy Level
4,990.00 kJ/mol  
99+
1,186.00 kJ/mol  
99+
15th Energy Level
49,900.00 kJ/mol  
99+
47,800.00 kJ/mol  
99+
16th Energy Level
49,900.00 kJ/mol  
99+
470.00 kJ/mol  
99+
17th Energy Level
499.00 kJ/mol  
99+
1,186.00 kJ/mol  
15
18th Energy Level
4,990.00 kJ/mol  
99+
4,780.00 kJ/mol  
99+
19th Energy Level
499.00 kJ/mol  
99+
1,186.00 kJ/mol  
12
20th Energy Level
499.00 kJ/mol  
99+
860.00 kJ/mol  
17
21st Energy Level
4,990.00 kJ/mol  
25
1,186.00 kJ/mol  
27
22nd Energy Level
499.00 kJ/mol  
99+
388.00 kJ/mol  
99+
23rd Energy Level
4,990.00 kJ/mol  
29
1,180.00 kJ/mol  
32
24th Energy Level
499.00 kJ/mol  
99+
546.10 kJ/mol  
99+
25th Energy Level
499.00 kJ/mol  
99+
0.00 kJ/mol  
99+
26th Energy Level
499.00 kJ/mol  
99+
594.70 kJ/mol  
99+
27th Energy Level
499.00 kJ/mol  
99+
470.00 kJ/mol  
99+
28th Energy Level
499.00 kJ/mol  
99+
478.00 kJ/mol  
99+
29th Energy Level
499.00 kJ/mol  
99+
580.00 kJ/mol  
99+
30th Energy Level
499.00 kJ/mol  
99+
0.00 kJ/mol  
99+
Electrochemical Equivalent
2.82 g/amp-hr  
22
3.23 g/amp-hr  
12
Electron Work Function
4.38 eV  
23
4.90 eV  
12
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Ionization, Radioactive Isotopes  
Atomic
Atomic Number
89  
29
103  
15
Electron Configuration
[Rn] 6d1 7s2  
[Rn] 5f14 7s2 7p1  
Crystal Structure
Face Centered Cubic (FCC)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
FCC-Crystal-Structure-of-Actinium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
89  
29
103  
15
Number of Neutrons
138  
17
157  
8
Number of Electrons
89  
29
103  
15
Radius of an Atom
  
  
Atomic Radius
195.00 pm  
9
162.00 pm  
28
Covalent Radius
186.00 pm  
21
162.00 pm  
31
Van der Waals Radius
215.00 pm  
31
246.00 pm  
12
Atomic Weight
227.00 amu  
25
266.00 amu  
12
Atomic Volume
22.54 cm3/mol  
20
35.10 cm3/mol  
7
Adjacent Atomic Numbers
  
  
Previous Element
Radium
  
Nobelium
  
Next Element
Thorium
  
Rutherfordium
  
Valence Electron Potential
38.60 (-eV)  
99+
0.00 (-eV)  
99+
Lattice Constant
567.00 pm  
9
530.00 pm  
14
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.89  
2
1.60  
22
Mechanical
Density
  
  
Density At Room Temperature
10.00 g/cm3  
40
15.00 g/cm3  
22
Density When Liquid (at m.p.)
10.07 g/cm3  
40
15.60 g/cm3  
20
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)  
37
Elasticity properties
  
  
Shear Modulus
25.00 GPa  
38
30.00 GPa  
27
Bulk Modulus
94.00 GPa  
17
15.00 GPa  
99+
Young's Modulus
130.00 GPa  
16
210.00 GPa  
10
Poisson Ratio
0.34  
10
0.32  
12
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
10.07  
99+
15.60  
22
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
17
0.00 H/m  
13
Susceptibility
0.00  
24
0.00  
23
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
5.20 nΩ·m  
99+
8.37 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+
0.22 J/(kg K)  
29
Molar Heat Capacity
27.20 J/mol·K  
24
27.00 J/mol·K  
29
Thermal Conductivity
12.00 W/m·K  
99+
0.00 W/m·K  
99+
Critical Temperature
1,323.00 K  
99+
1,323.00 K  
99+
Thermal Expansion
12.10 µm/(m·K)  
99+
8.50 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
120.00 kJ/mol  
99+
341.90 kJ/mol  
37
Enthalpy of Fusion
14.20 kJ/mol  
28
-  
Enthalpy of Atomization
301.00 kJ/mol  
99+
580.00 kJ/mol  
14
Standard Molar Entropy
56.50 J/mol.K  
33
54.80 J/mol.K  
35
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