Symbol
Ac
Group Number
3
Rank: 15 (Overall)
0
17
👆🏻
Period Number
7
Rank: 1 (Overall)
2
7
👆🏻
Block
f block
Element Family
Actinide
CAS Number
7440348
Rank: 47 (Overall)
7429905
54386242
👆🏻
Space Group Name
Fm_ 3m
Space Group Number
225.00
Rank: 3 (Overall)
11
276
👆🏻
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 %
Rank: 34 (Overall)
0
0.11
👆🏻
Abundance In Sun
0.00 %
Rank: 26 (Overall)
0
0.1
👆🏻
Abundance In Meteorites
0.00 %
Rank: 53 (Overall)
0
22
👆🏻
Abundance In Earth's Crust
0.00 %
Rank: 58 (Overall)
1E-37
8.1
👆🏻
Abundance In Oceans
0.00 %
Rank: 48 (Overall)
0
1.1
👆🏻
Abundance In Humans
0.00 %
Rank: 24 (Overall)
0
1.4
👆🏻
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
✔
✘
7% - Actinide Series Metals
In Blood
0.00 Blood/mg dm-3
Rank: 40 (Overall)
0
1970
👆🏻
In Bone
0.00 p.p.m.
Rank: 41 (Overall)
0
170000
👆🏻
Melting Point
1,227.00 °C
Rank: 38 (Overall)
-38.83
3410
👆🏻
Boiling Point
3,200.00 °C
Rank: 27 (Overall)
0
5660
👆🏻
Appearance
Physical State
Solid
Color
Silvery White
Luster
-
Hardness
Mohs Hardness
6.50
Rank: 5 (Overall)
0.2
8.5
👆🏻
Brinell Hardness
70.00 MPa
Rank: 61 (Overall)
0.14
3490
👆🏻
Vickers Hardness
260.00 MPa
Rank: 48 (Overall)
0
3920
👆🏻
Speed of Sound
3,430.00 m/s
Rank: 32 (Overall)
818
16200
👆🏻
Optical Properties
Refractive Index
1.00
Rank: 49 (Overall)
0.155
3.41
👆🏻
Reflectivity
62.00 %
Rank: 21 (Overall)
5
97
👆🏻
Allotropes
✔
✘
No - Actinide Series Metals has it !
α Allotropes
-
β Allotropes
-
γ Allotropes
-
Chemical Formula
Ac
Isotopes
Known Isotopes
29
Rank: 10 (Overall)
0
38
👆🏻
Electronegativity
Pauling Electronegativity
1.10
Rank: 45 (Overall)
0
2.6
👆🏻
Sanderson Electronegativity
1.10
Rank: 38 (Overall)
0.22
2.56
👆🏻
Allred Rochow Electronegativity
1.00
Rank: 37 (Overall)
0.86
1.9
👆🏻
Mulliken-Jaffe Electronegativity
1.10
Rank: 44 (Overall)
0.62
2.48
👆🏻
Allen Electronegativity
1.10
Rank: 55 (Overall)
0.659
2.7
👆🏻
Electropositivity
Pauling Electropositivity
2.90
Rank: 10 (Overall)
1.46
3.3
👆🏻
Ionization Energies
1st Energy Level
499.00 kJ/mol
Rank: 84 (Overall)
375.7
26130
👆🏻
2nd Energy Level
1,170.00 kJ/mol
Rank: 66 (Overall)
392.8
28750
👆🏻
3rd Energy Level
1,900.00 kJ/mol
Rank: 83 (Overall)
392.8
34230
👆🏻
4th Energy Level
4,700.00 kJ/mol
Rank: 33 (Overall)
375.7
37066
👆🏻
5th Energy Level
4,990.00 kJ/mol
Rank: 75 (Overall)
392
97510
👆🏻
6th Energy Level
5,750.00 kJ/mol
Rank: 71 (Overall)
1007
105800
👆🏻
7th Energy level
5,750.00 kJ/mol
Rank: 62 (Overall)
1007
114300
👆🏻
8th Energy Level
5,750.00 kJ/mol
Rank: 60 (Overall)
730
125300
👆🏻
9th Energy Level
4,990.00 kJ/mol
Rank: 78 (Overall)
1007
134700
👆🏻
10th Energy Level
4,990.00 kJ/mol
Rank: 75 (Overall)
392
144300
👆🏻
11th Energy Level
4,990.00 kJ/mol
Rank: 80 (Overall)
392
169988
👆🏻
12th Energy Level
49,900.00 kJ/mol
Rank: 21 (Overall)
0
189368
👆🏻
13th Energy Level
4,990.00 kJ/mol
Rank: 73 (Overall)
1007
76015
👆🏻
14th Energy Level
4,990.00 kJ/mol
Rank: 57 (Overall)
380
86450
👆🏻
15th Energy Level
49,900.00 kJ/mol
Rank: 73 (Overall)
33000
100700
👆🏻
16th Energy Level
49,900.00 kJ/mol
Rank: 60 (Overall)
375.7
109480
👆🏻
17th Energy Level
499.00 kJ/mol
Rank: 88 (Overall)
375.7
122200
👆🏻
18th Energy Level
4,990.00 kJ/mol
Rank: 73 (Overall)
0
134810
👆🏻
19th Energy Level
499.00 kJ/mol
Rank: 87 (Overall)
375.7
148700
👆🏻
20th Energy Level
499.00 kJ/mol
Rank: 77 (Overall)
0
171200
👆🏻
21st Energy Level
4,990.00 kJ/mol
Rank: 25 (Overall)
375.7
179100
👆🏻
22nd Energy Level
499.00 kJ/mol
Rank: 71 (Overall)
330
184900
👆🏻
23rd Energy Level
4,990.00 kJ/mol
Rank: 29 (Overall)
357.6
198800
👆🏻
24th Energy Level
499.00 kJ/mol
Rank: 83 (Overall)
297.3
195200
👆🏻
25th Energy Level
499.00 kJ/mol
Rank: 75 (Overall)
0
121900
👆🏻
26th Energy Level
499.00 kJ/mol
Rank: 83 (Overall)
357.6
127700
👆🏻
27th Energy Level
499.00 kJ/mol
Rank: 78 (Overall)
0
133800
👆🏻
28th Energy Level
499.00 kJ/mol
Rank: 81 (Overall)
297.3
139800
👆🏻
29th Energy Level
499.00 kJ/mol
Rank: 84 (Overall)
0
148100
👆🏻
30th Energy Level
499.00 kJ/mol
Rank: 78 (Overall)
0
154500
👆🏻
Electrochemical Equivalent
2.82 g/amp-hr
Rank: 22 (Overall)
0.16812
8.3209
👆🏻
Electron Work Function
4.38 eV
Rank: 23 (Overall)
2.14
6
👆🏻
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Number
89
Rank: 29 (Overall)
3
117
👆🏻
Electron Configuration
[Rn] 6d1 7s2
Crystal Structure
Face Centered Cubic (FCC)
Crystal Lattice
Atom
Number of Protons
89
Rank: 29 (Overall)
3
117
👆🏻
Number of Neutrons
138
Rank: 17 (Overall)
4
285
👆🏻
Number of Electrons
89
Rank: 29 (Overall)
3
117
👆🏻
Radius of an Atom
Atomic Radius
195.00 pm
Rank: 9 (Overall)
0
348
👆🏻
Covalent Radius
186.00 pm
Rank: 21 (Overall)
0
260
👆🏻
Van der Waals Radius
215.00 pm
Rank: 31 (Overall)
0
348
👆🏻
Atomic Weight
227.00 amu
Rank: 25 (Overall)
6.94
294
👆🏻
Atomic Volume
22.54 cm3/mol
Rank: 20 (Overall)
1.39
71.07
👆🏻
Adjacent Atomic Numbers
Previous Element
Next Element
Valence Electron Potential
38.60 (-eV)
Rank: 50 (Overall)
0
392.42
👆🏻
Lattice Constant
567.00 pm
Rank: 9 (Overall)
0
891.25
👆🏻
Lattice Angles
π/2, π/2, π/2
Lattice C/A Ratio
1.89
Rank: 2 (Overall)
0.423
1.9
👆🏻
Density
Density At Room Temperature
10.00 g/cm3
Rank: 40 (Overall)
0.534
40.7
👆🏻
Density When Liquid (at m.p.)
10.07 g/cm3
Rank: 40 (Overall)
0.512
41
👆🏻
Tensile Strength
65.00 MPa
Rank: 33 (Overall)
0.1
11000
👆🏻
Viscosity
0.00
Rank: 25 (Overall)
1.5E-05
0.0035
👆🏻
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)
Rank: 22 (Overall)
0
121
👆🏻
Vapor Pressure at 2000 K
0.00 (Pa)
Rank: 30 (Overall)
0
774
👆🏻
Elasticity properties
Shear Modulus
25.00 GPa
Rank: 38 (Overall)
1.3
222
👆🏻
Bulk Modulus
94.00 GPa
Rank: 17 (Overall)
0
462
👆🏻
Young's Modulus
130.00 GPa
Rank: 16 (Overall)
0
528
👆🏻
Poisson Ratio
0.34
Rank: 10 (Overall)
0.032
0.47
👆🏻
Other Mechanical Properties
-
Magnetic Characteristics
Specific Gravity
10.07
Rank: 41 (Overall)
0.53
4500
👆🏻
Magnetic Ordering
Paramagnetic
Permeability
0.00 H/m
Rank: 17 (Overall)
1.25643E-06
0.0063
👆🏻
Susceptibility
0.00
Rank: 24 (Overall)
-0.000166
200000
👆🏻
Electrical Properties
Electrical Property
-
Resistivity
5.20 nΩ·m
Rank: 62 (Overall)
0.1
961
👆🏻
Electrical Conductivity
0.15 106/cm Ω
Rank: 13 (Overall)
0
0.63
👆🏻
Electron Affinity
33.20 kJ/mol
Rank: 34 (Overall)
0
222.8
👆🏻
Specific Heat
0.12 J/(kg K)
Rank: 42 (Overall)
0.1
3.6
👆🏻
Molar Heat Capacity
27.20 J/mol·K
Rank: 24 (Overall)
13.1
62.7
👆🏻
Thermal Conductivity
12.00 W/m·K
Rank: 62 (Overall)
0
429
👆🏻
Critical Temperature
1,323.00 K
Rank: 47 (Overall)
26.3
3695
👆🏻
Thermal Expansion
12.10 µm/(m·K)
Rank: 43 (Overall)
4.5
97
👆🏻
Enthalpy
Enthalpy of Vaporization
120.00 kJ/mol
Rank: 76 (Overall)
7.32
799.1
👆🏻
Enthalpy of Fusion
14.20 kJ/mol
Rank: 28 (Overall)
2.1
35.23
👆🏻
Enthalpy of Atomization
301.00 kJ/mol
Rank: 47 (Overall)
61.5
837
👆🏻
Standard Molar Entropy
56.50 J/mol.K
Rank: 33 (Overall)
9.5
198.1
👆🏻