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What is Actinium?

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Nihonium
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Tennessine
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Actinium In Periodic Table

Symbol
Ac

Group Number
Not Available
📊

Period Number
7
📊

Block
f block
📊

Element Family
Actinide
📊

CAS Number
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

Melting Point
1,227.00 °C
38
📊

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
89
29
📊

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

Density of Actinium

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
📊

Actinium Metal

Metals have been an inseparable component of major civilizations since centuries. Although metals were utilized since time unknown, researchers put considerable efforts in giving them appropriate names and defining their different properties and characteristics. This nomenclature process helped in arranging these metals in a well-organized fashion, known as the periodic table. In this periodic table, Actinium metal is also represented by the symbol Ac. This atomic symbol of Actinium is useful in indicating the position of metal Ac in the periodic table. If you are curious-headed or a science-geek, the common questions about metals are What is Actinium? What are its physical, chemical, mechanical, electrical and thermal properties? Find all the relevant facts about Ac metals in the following sections.

Periodic Table of Actinium

Periodic table of Actinium comments over its position in the periodic table, on the basis of parameters like group number, period row, atomic number and orbital block. The metals which have electrons falling in the same sub-shell are grouped under the same block corresponding to its respective orbital. Actinium metal belongs to Actinide Series category of the periodic table. Metals down a group have same valency while metals across a period have the same number of shells. Its group number (column number) is Not Available, whereas its period number is 7. It is placed under f block of the periodic table & is one of the prominent f block elements.

Actinium Metal Properties

Metals have certain properties by which they can be distinguished from one another. Magnetic and Atomic Structure of Actinium are few widely searched properties. Using the comparison facility, you can not only view the individual metal properties, but also compare the properties of multiple metals to get a thorough comparative analysis between the metals of your choice. Atomic number is a basic building block for the arrangement of metals in the periodic table. Atomic number of Actinium is 89 and its atomic weight is 227.00 amu. The electrons in its atom are arranged in orbitals as [Rn] 6d1 7s2. Nuclear particles in Actinium atom are 138 neutrons, 89 protons and 89 electrons.

Physical and Chemical Characteristics of Actinium

Physical and chemical characteristics of Actinium are two major criteria while comparing this metal with other metals. Physical Properties of Actinium include its external appearance, shininess at surface, color, etc. Properties like density, viscosity, melting and boiling point are also covered in this section. At room temperature, this metal is a Silvery White Solid. It starts melting at 1,227.00 °C. All these Actinium metal properties together define what is Actinium?

Modern Periodic Table

Modern Periodic Table
Group →

Period ↓

1

2

3

4

5

6

7

1

H

2

3

La-Lu
Ac-Lr

4

5

6

7

8

9

10

11

12

13

B

14

C
Si
Ge

15

N
P
As
Sb

16

O
S
Se
Te

17

F
Cl
Br
I
At

18

He
Ne
Ar
Kr
Xe
Rn
Og