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What is Protactinium?

Protactinium In Periodic Table

Protactinium Symbol
Pa

Group Number
Not Available

Period Number
7
📊

Block
f block
📊

Element Family
Actinide
📊

CAS Number of Protactinium
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

Protactinium Melting Point
1,568.00 °C
21
📊

Protactinium 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 of Protactinium
91
27
📊

Protactinium 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

Protactinium Density

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
📊