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Ac Element
Actinium


Periodic Table
Symbol
Ac
Group Number
3 15
Period Number
7 1
Block
f block
Element Family
Actinide
CAS Number
7440348 47
Space Group Name
Fm_ 3m
Space Group Number
225.00 3
Facts
Interesting Facts
Actinium glows in the dark due to its radioactivity.
Sources
Obtained by Treating Radium with Neutrons, Ores of metals
History
Who Discovered
Friedrich Oskar Giesel
Discovery
In 1902
Abundance
Abundance In Universe
0.00 % 34
Abundance In Sun
0.00 % 26
Abundance In Meteorites
0.00 % 53
Abundance In Earth's Crust
0.00 % 58
Abundance In Oceans
0.00 % 48
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.
Industrial Uses
-
Medical Uses
-
Other Uses
Alloys, Nuclear Research, Research Purposes
Biological Properties
Toxicity
Toxic
Present in Human Body
No
In Blood
0.00 Blood/mg dm-3 40
In Bone
0.00 p.p.m. 41
Physical
Melting Point
1,227.00 °C 38
Boiling Point
3,200.00 °C 27
Appearance
Physical State
Solid
Color
Silvery White
Luster
-
Hardness
Mohs Hardness
6.50 5
Brinell Hardness
70.00 MPa 61
Vickers Hardness
260.00 MPa 48
Speed of Sound
3,430.00 m/s 32
Optical Properties
Refractive Index
1.00 49
Reflectivity
62.00 % 21
Allotropes
No
α Allotropes
-
β Allotropes
-
γ Allotropes
-
Chemical
Chemical Formula
Ac
Isotopes
Known Isotopes
29 10
Electronegativity
Pauling Electronegativity
1.10 45
Sanderson Electronegativity
1.10 38
Allred Rochow Electronegativity
1.00 37
Mulliken-Jaffe Electronegativity
1.10 44
Allen Electronegativity
1.10 55
Electropositivity
Pauling Electropositivity
2.90 10
Ionization Energies
1st Energy Level
499.00 kJ/mol 84
2nd Energy Level
1,170.00 kJ/mol 66
3rd Energy Level
1,900.00 kJ/mol 83
4th Energy Level
4,700.00 kJ/mol 33
5th Energy Level
4,990.00 kJ/mol 75
6th Energy Level
5,750.00 kJ/mol 71
7th Energy level
5,750.00 kJ/mol 62
8th Energy Level
5,750.00 kJ/mol 60
9th Energy Level
4,990.00 kJ/mol 78
10th Energy Level
4,990.00 kJ/mol 75
11th Energy Level
4,990.00 kJ/mol 80
12th Energy Level
49,900.00 kJ/mol 21
13th Energy Level
4,990.00 kJ/mol 73
14th Energy Level
4,990.00 kJ/mol 57
15th Energy Level
49,900.00 kJ/mol 73
16th Energy Level
49,900.00 kJ/mol 60
17th Energy Level
499.00 kJ/mol 88
18th Energy Level
4,990.00 kJ/mol 73
19th Energy Level
499.00 kJ/mol 87
20th Energy Level
499.00 kJ/mol 77
21st Energy Level
4,990.00 kJ/mol 25
22nd Energy Level
499.00 kJ/mol 71
23rd Energy Level
4,990.00 kJ/mol 29
24th Energy Level
499.00 kJ/mol 83
25th Energy Level
499.00 kJ/mol 75
26th Energy Level
499.00 kJ/mol 83
27th Energy Level
499.00 kJ/mol 78
28th Energy Level
499.00 kJ/mol 81
29th Energy Level
499.00 kJ/mol 84
30th Energy Level
499.00 kJ/mol 78
Electrochemical Equivalent
2.82 g/amp-hr 22
Electron Work Function
4.38 eV 23
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic
Atomic Number
89 29
Electron Configuration
[Rn] 6d1 7s2
Crystal Structure
Face Centered Cubic (FCC)
Crystal Lattice
FCC-Crystal-Structure-of-Actinium.jpg#100
Atom
Number of Protons
89 29
Number of Neutrons
138 17
Number of Electrons
89 29
Radius of an Atom
Atomic Radius
195.00 pm 9
Covalent Radius
186.00 pm 21
Van der Waals Radius
215.00 pm 31
Atomic Weight
227.00 amu 25
Atomic Volume
22.54 cm3/mol 20
Adjacent Atomic Numbers
Previous Element
27
Next Element
16
Valence Electron Potential
38.60 (-eV) 50
Lattice Constant
567.00 pm 9
Lattice Angles
π/2, π/2, π/2
Lattice C/A Ratio
1.89 2
Mechanical
Density
Density At Room Temperature
10.00 g/cm3 40
Density When Liquid (at m.p.)
10.07 g/cm3 40
Tensile Strength
65.00 MPa 33
Viscosity
0.00 25
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa) 22
Vapor Pressure at 2000 K
0.00 (Pa) 30
Elasticity properties
Shear Modulus
25.00 GPa 38
Bulk Modulus
94.00 GPa 17
Young's Modulus
130.00 GPa 16
Poisson Ratio
0.34 10
Other Mechanical Properties
-
Magnetic
Magnetic Characteristics
Specific Gravity
10.07 41
Magnetic Ordering
Paramagnetic
Permeability
0.00 H/m 17
Susceptibility
0.00 24
Electrical Properties
Electrical Property
-
Resistivity
5.20 nΩ·m 62
Electrical Conductivity
0.15 106/cm Ω 13
Electron Affinity
33.20 kJ/mol 34
Thermal
Specific Heat
0.12 J/(kg K) 42
Molar Heat Capacity
27.20 J/mol·K 24
Thermal Conductivity
12.00 W/m·K 62
Critical Temperature
1,323.00 K 47
Thermal Expansion
12.10 µm/(m·K) 43
Enthalpy
Enthalpy of Vaporization
120.00 kJ/mol 76
Enthalpy of Fusion
14.20 kJ/mol 28
Enthalpy of Atomization
301.00 kJ/mol 47
Standard Molar Entropy
56.50 J/mol.K 33
Summary >>
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Actinide Series

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