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What is Protactinium?

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Nihonium
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Protactinium In Periodic Table

Symbol
Pa

Group Number
Not Available
📊

Period Number
7
📊

Block
f block
📊

Element Family
Actinide
📊

CAS Number
7440133
66

Space Group Name
I4/mmm

Space Group Number
139.00
8
📊

Facts about Protactinium

Interesting Facts
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.

Sources
Found in Uranium Ores, Mining, Ores of metals

History of Protactinium

Who Discovered
William Crookes

Discovery
In 1900

Abundance of Protactinium

Abundance In Universe
Not Available
📊

Abundance In Sun
Not Available
📊

Abundance In Meteorites
Not Available
📊

Abundance In Earth's Crust
0.00 %
57
📊

Abundance In Oceans
0.00 %
47
📊

Abundance In Humans
Not Available
📊

Uses of Protactinium

Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.

Industrial Uses
NA

Medical Uses
NA

Other Uses
NA

Biological Properties

Toxicity
Highly 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 Protactinium

Melting Point
1,568.00 °C
21
📊

Boiling Point
4,027.00 °C
12
📊

Appearance of Protactinium

Physical State
Solid
📊

Color
Silver

Luster
Metallic
📊

Hardness of Protactinium

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 Protactinium

Chemical Formula
Pa

Isotopes of Protactinium

Known Isotopes
27
12
📊

Electronegativity

Pauling Electronegativity
1.50
27
📊

Sanderson Electronegativity
Not Available
📊

Allred Rochow Electronegativity
1.14
28
📊

Mulliken-Jaffe Electronegativity
Not Available
📊

Allen Electronegativity
Not Available
📊

Electropositivity

Pauling Electropositivity
2.50
27
📊

Ionization Energies

1st Energy Level
568.00 kJ/mol
68
📊

2nd Energy Level
1,128.00 kJ/mol
72
📊

3rd Energy Level
1,814.00 kJ/mol
81
📊

4th Energy Level
2,991.00 kJ/mol
66
📊

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
1.72 g/amp-hr
43
📊

Electron Work Function
Not Available
📊

Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity

Atomic Properties of Protactinium

Atomic Number
91
27
📊

Electron Configuration
[Rn] 5f2 6d1 7s2

Crystal Structure
Tetragonal (TETR)
📊

Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100

Atom of Protactinium

Number of Protons
91
27
📊

Number of Neutrons
122
22
📊

Number of Electrons
91
27
📊

Radius of an Atom

Atomic Radius
163.00 pm
25
📊

Covalent Radius
200.00 pm
11
📊

Van der Waals Radius
243.00 pm
11
📊

Atomic Weight
231.04 amu
24
📊

Atomic Volume
15.00 cm3/mol
34
📊

Adjacent Atomic Numbers

Previous Element

Next Element

Valence Electron Potential
92.00 (-eV)
11
📊

Lattice Constant
392.50 pm
23
📊

Lattice Angles
π/2, π/2, π/2

Lattice C/A Ratio
Not Available
📊

Mechanical Properties of Protactinium

Density of Protactinium

Density At Room Temperature
15.37 g/cm3
20
📊

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

Tensile Strength
Not Available
📊

Viscosity
Not Available
📊

Vapor Pressure of Protactinium

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
Unknown

Magnetic Properties of Protactinium

Magnetic Characteristics of Protactinium

Specific Gravity
15.37
12
📊

Magnetic Ordering
Paramagnetic
📊

Permeability
Not Available
📊

Susceptibility
Not Available
📊

Electrical Properties

Electrical Property
Conductor
📊

Resistivity
177.00 nΩ·m
21
📊

Electrical Conductivity
0.05 106/cm Ω
34
📊

Electron Affinity
Not Available
📊

Thermal Properties of Protactinium

Specific Heat
0.12 J/(kg K)
40
📊

Molar Heat Capacity
Not Available
📊

Thermal Conductivity
47.00 W/m·K
32
📊

Critical Temperature
Not Available

Thermal Expansion
9.90 µm/(m·K)
40
📊

Enthalpy of Protactinium

Enthalpy of Vaporization
Not Available
📊

Enthalpy of Fusion
12.34 kJ/mol
28
📊

Enthalpy of Atomization
Not Available
📊

Standard Molar Entropy
198.10 J/mol.K
1
📊

Protactinium 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, Protactinium metal is also represented by the symbol Pa. This atomic symbol of Protactinium is useful in indicating the position of metal Pa in the periodic table. If you are curious-headed or a science-geek, the common questions about metals are What is Protactinium? What are its physical, chemical, mechanical, electrical and thermal properties? Find all the relevant facts about Pa metals in the following sections.

Periodic Table of Protactinium

Periodic table of Protactinium 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. Protactinium 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.

Protactinium Metal Properties

Metals have certain properties by which they can be distinguished from one another. Magnetic and Atomic Structure of Protactinium 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 Protactinium is 91 and its atomic weight is 231.04 amu. The electrons in its atom are arranged in orbitals as [Rn] 5f2 6d1 7s2. Nuclear particles in Protactinium atom are 122 neutrons, 91 protons and 91 electrons.

Physical and Chemical Characteristics of Protactinium

Physical and chemical characteristics of Protactinium are two major criteria while comparing this metal with other metals. Physical Properties of Protactinium 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 Silver Solid. It starts melting at 1,568.00 °C. All these Protactinium metal properties together define what is Protactinium?

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