Manganese vs Protactinium
Periodic Table
Symbol
Mn
Pa
Group Number
7
11
Not Available
Period Number
4
7
Block
d block
f block
Element Family
Transition Metal
Actinide
CAS Number
7439965
99+
7440133
99+
Space Group Name
I_ 43m
I4/mmm
Space Group Number
217.00
4
139.00
8
Facts
Interesting Facts
- Manganese is an essential trace element in all forms of life.
- Manganese metal oxidizes very easily, but it does not fuse that easily.
- Protactinium metal has 29 isotopes.
- Isotopes of Protactinium-231 used in nuclear weapon.
Sources
Found in Minerals, Mining, Ores of Minerals
Found in Uranium Ores, Mining, Ores of metals
History
Who Discovered
Johann Gottlieb Gahn
William Crookes
Discovery
In 1774
In 1900
Abundance
Abundance In Universe
8 * 10-4 %
8
Not Available
Abundance In Sun
~0.001 %
8
~-9999 %
Abundance In Meteorites
0.27 %
8
Not Available
Abundance In Earth's Crust
0.11 %
8
0.00 %
99+
Abundance In Oceans
0.00 %
13
0.00 %
99+
Abundance In Humans
0.00 %
13
Not Available
Uses
Uses & Benefits
- This metal is very brittle hence it mostly not used as a pure metal, but its alloys are very useful
- Its alloy Manganese steel is extremely strong and used in railway tracks, safes, prison bars and riffle barrels.
- Currently known uses of Protactinium metal are limited to research purpose only.
Industrial Uses
Automobile Industry, Electrical Industry, Electronic Industry
NA
Medical Uses
NA
NA
Other Uses
Alloys
NA
Biological Properties
Toxicity
Toxic
Highly Toxic
Present in Human Body
Yes
No
In Blood
0.08 Blood/mg dm-3
14
0.00 Blood/mg dm-3
37
In Bone
100.00 p.p.m.
8
0.00 p.p.m.
36
Physical Properties
Melting Point
1,245.00 °C
37
1,568.00 °C
21
Boiling Point
1,962.00 °C
99+
4,027.00 °C
12
Appearance
Physical State
Solid
Solid
Color
Silver
Silver
Luster
Metallic
Metallic
Hardness
Mohs Hardness
6.00
6
Not Available
Brinell Hardness
196.00 MPa
99+
Not Available
Speed of Sound
5,150.00 m/s
7
Not Available
Optical Properties
Allotropes
No
No
α Allotropes
Not Available
Not Available
β Allotropes
Not Available
Not Available
γ Allotropes
Not Available
Not Available
Chemical Properties
Chemical Formula
Mn
Pa
Isotopes
Known Isotopes
21
18
27
12
Electronegativity
Pauling Electronegativity
1.55
25
1.50
27
Sanderson Electronegativity
2.20
7
Not Available
Allred Rochow Electronegativity
1.60
9
1.14
28
Allen Electronegativity
1.75
15
Not Available
Electropositivity
Pauling Electropositivity
2.45
29
2.50
27
Ionization Energies
1st Energy Level
717.30 kJ/mol
30
568.00 kJ/mol
99+
2nd Energy Level
1,509.00 kJ/mol
39
1,128.00 kJ/mol
99+
3rd Energy Level
3,248.00 kJ/mol
21
1,814.00 kJ/mol
99+
4th Energy Level
4,940.00 kJ/mol
20
2,991.00 kJ/mol
99+
5th Energy Level
6,990.00 kJ/mol
17
Not Available
6th Energy Level
9,220.00 kJ/mol
16
Not Available
7th Energy level
11,500.00 kJ/mol
16
Not Available
8th Energy Level
18,770.00 kJ/mol
5
Not Available
9th Energy Level
21,400.00 kJ/mol
6
Not Available
10th Energy Level
23,960.00 kJ/mol
9
Not Available
11th Energy Level
27,590.00 kJ/mol
10
Not Available
12th Energy Level
30,330.00 kJ/mol
10
Not Available
13th Energy Level
33,150.00 kJ/mol
11
Not Available
14th Energy Level
38,880.00 kJ/mol
10
Not Available
15th Energy Level
41,987.00 kJ/mol
13
Not Available
16th Energy Level
109,480.00 kJ/mol
1
Not Available
17th Energy Level
118,100.00 kJ/mol
2
Not Available
18th Energy Level
127,100.00 kJ/mol
3
Not Available
19th Energy Level
138,600.00 kJ/mol
4
Not Available
20th Energy Level
148,500.00 kJ/mol
6
Not Available
21st Energy Level
158,600.00 kJ/mol
6
Not Available
22nd Energy Level
172,500.00 kJ/mol
5
Not Available
23rd Energy Level
181,380.00 kJ/mol
5
Not Available
Electrochemical Equivalent
0.29 g/amp-hr
99+
1.72 g/amp-hr
99+
Electron Work Function
4.10 eV
25
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes
Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
25
99+
91
27
Electron Configuration
[Ar] 3d5 4s2
[Rn] 5f2 6d1 7s2
Crystal Structure
Body Centered Cubic (BCC)
Tetragonal (TETR)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
TETR-Crystal-Structure-of-Protactinium.jpg#100
Atom
Number of Protons
25
99+
91
27
Number of Neutrons
30
99+
122
21
Number of Electrons
25
99+
91
27
Radius of an Atom
Atomic Radius
127.00 pm
99+
163.00 pm
25
Covalent Radius
139.00 pm
99+
200.00 pm
11
Van der Waals Radius
200.00 pm
28
243.00 pm
11
Atomic Weight
54.94 amu
99+
231.04 amu
24
Atomic Volume
1.39 cm3/mol
99+
15.00 cm3/mol
34
Adjacent Atomic Numbers
Valence Electron Potential
220.00 (-eV)
2
92.00 (-eV)
11
Lattice Constant
891.25 pm
1
392.50 pm
23
Lattice Angles
π/2, π/2, π/2
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
7.21 g/cm3
99+
15.37 g/cm3
20
Density When Liquid (at m.p.)
5.95 g/cm3
99+
Not Available
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)
12
Not Available
Elasticity properties
Bulk Modulus
120.00 GPa
14
Not Available
Young's Modulus
198.00 GPa
12
Not Available
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
NA
Unknown
Magnetic Properties
Magnetic Characteristics
Specific Gravity
7.21
99+
15.37
12
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
1.44 nΩ·m
99+
177.00 nΩ·m
21
Electrical Conductivity
0.01 106/cm Ω
99+
0.05 106/cm Ω
34
Electron Affinity
0.00 kJ/mol
40
Not Available
Thermal Properties
Specific Heat
0.48 J/(kg K)
11
0.12 J/(kg K)
40
Molar Heat Capacity
26.32 J/mol·K
29
Not Available
Thermal Conductivity
7.81 W/m·K
99+
47.00 W/m·K
32
Critical Temperature
Not Available
Not Available
Thermal Expansion
21.70 µm/(m·K)
21
9.90 µm/(m·K)
40
Enthalpy
Enthalpy of Vaporization
219.70 kJ/mol
99+
Not Available
Enthalpy of Fusion
14.64 kJ/mol
23
12.34 kJ/mol
28
Enthalpy of Atomization
280.30 kJ/mol
38
Not Available
Standard Molar Entropy
32.00 J/mol.K
99+
198.10 J/mol.K
1
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