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What is Actinium?

Actinium In Periodic Table

Actinium Symbol
Ac

Group Number
Not Available

Period Number
7
📊

Block
f block
📊

Element Family
Actinide
📊

CAS Number of Actinium
7440348
47

Space Group Name
Fm_ 3m

Space Group Number
225.00
2
📊

Facts about Actinium

Interesting Facts
Not Available

Sources
Obtained by Treating Radium with Neutrons, Ores of metals

History of Actinium

Who Discovered
Friedrich Oskar Giesel

Discovery
In 1902

Abundance of Actinium

Abundance In Universe
Not Available

Abundance In Sun
Not Available

Abundance In Meteorites
Not Available

Abundance In Earth's Crust
Not Available

Abundance In Oceans
Not Available

Abundance In Humans
Not Available

Uses of Actinium

Uses & Benefits
  • Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.

Industrial Uses
NA

Medical Uses
NA

Other Uses
Alloys, Nuclear Research, Research Purposes

Biological Properties

Toxicity
Toxic
📊

Present in Human Body
📊

In Blood
0.00 Blood/mg dm-3
37

In Bone
0.00 p.p.m.
36

Physical Properties of Actinium

Actinium Melting Point
1,227.00 °C
38
📊

Actinium Boiling Point
3,200.00 °C
26
📊

Appearance of Actinium

Physical State
Solid
📊

Color
Silvery White

Luster
NA

Hardness of Actinium

Mohs Hardness
Not Available

Brinell Hardness
Not Available

Vickers Hardness
Not Available

Speed of Sound
Not Available

Optical Properties

Refractive Index
Not Available

Reflectivity
Not Available

Allotropes

α Allotropes
Not Available

β Allotropes
Not Available

γ Allotropes
Not Available

Chemical Properties of Actinium

Chemical Formula
Ac

Isotopes of Actinium

Known Isotopes
29
10
📊

Electronegativity

Pauling Electronegativity
1.10
44
📊

Sanderson Electronegativity
Not Available

Allred Rochow Electronegativity
1.00
36
📊

Mulliken-Jaffe Electronegativity
Not Available

Allen Electronegativity
Not Available

Electropositivity

Pauling Electropositivity
2.90
10
📊

Ionization Energies

1st Energy Level
499.00 kJ/mol
84
📊

2nd Energy Level
1,170.00 kJ/mol
65
📊

3rd Energy Level
1,900.00 kJ/mol
79
📊

4th Energy Level
4,700.00 kJ/mol
23
📊

5th Energy Level
Not Available

6th Energy Level
Not Available

7th Energy level
Not Available

8th Energy Level
Not Available

9th Energy Level
Not Available

10th Energy Level
Not Available

11th Energy Level
Not Available

12th Energy Level
Not Available

13th Energy Level
Not Available

14th Energy Level
Not Available

15th Energy Level
Not Available

16th Energy Level
Not Available

17th Energy Level
Not Available

18th Energy Level
Not Available

19th Energy Level
Not Available

20th Energy Level
Not Available

21st Energy Level
Not Available

22nd Energy Level
Not Available

23rd Energy Level
Not Available

24th Energy Level
Not Available

25th Energy Level
Not Available

26th Energy Level
Not Available

27th Energy Level
Not Available

28th Energy Level
Not Available

29th Energy Level
Not Available

30th Energy Level
Not Available

Electrochemical Equivalent
2.82 g/amp-hr
18
📊

Electron Work Function
Not Available

Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility

Atomic Properties of Actinium

Atomic Number of Actinium
89
29
📊

Actinium Electron Configuration
[Rn] 6d1 7s2

Crystal Structure
Face Centered Cubic (FCC)
📊

Crystal Lattice
FCC-Crystal-Structure-of-Actinium.jpg#100

Atom of Actinium

Number of Protons
89
29
📊

Number of Neutrons
138
17
📊

Number of Electrons
89
29
📊

Radius of an Atom

Atomic Radius
195.00 pm
7
📊

Covalent Radius
Not Available

Van der Waals Radius
Not Available

Atomic Weight
227.00 amu
25
📊

Atomic Volume
22.54 cm3/mol
11
📊

Adjacent Atomic Numbers

Previous Element

Next Element

Valence Electron Potential
38.60 (-eV)
49
📊

Lattice Constant
567.00 pm
8
📊

Lattice Angles
π/2, π/2, π/2

Lattice C/A Ratio
Not Available

Mechanical Properties of Actinium

Actinium Density

Density At Room Temperature
10.00 g/cm3
37
📊

Density When Liquid (at m.p.)
Not Available

Tensile Strength
Not Available

Viscosity
Not Available

Vapor Pressure of Actinium

Vapor Pressure at 1000 K
Not Available

Vapor Pressure at 2000 K
Not Available

Elasticity properties

Shear Modulus
Not Available

Bulk Modulus
Not Available

Young's Modulus
Not Available

Poisson Ratio
Not Available

Other Mechanical Properties
NA

Magnetic Properties of Actinium

Magnetic Characteristics of Actinium

Specific Gravity
10.07
28
📊

Magnetic Ordering
Paramagnetic
📊

Permeability
Not Available

Susceptibility
Not Available

Electrical Properties

Electrical Property
Unknown

Resistivity
Not Available

Electrical Conductivity
Not Available

Electron Affinity
Not Available

Thermal Properties of Actinium

Specific Heat
0.12 J/(kg K)
40
📊

Molar Heat Capacity
27.20 J/mol·K
18
📊

Thermal Conductivity
12.00 W/m·K
60
📊

Critical Temperature
Not Available

Thermal Expansion
Not Available

Enthalpy of Actinium

Enthalpy of Vaporization
Not Available

Enthalpy of Fusion
Not Available

Enthalpy of Atomization
301.00 kJ/mol
36
📊

Standard Molar Entropy
56.50 J/mol.K
25
📊