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Protactinium vs Americium

Protactinium
Americium
Americium vs Protactinium


Periodic Table
Symbol
Pa  
Am  
Group Number
3  
15
10  
8
Period Number
7  
7  
Block
f block  
f block  
Element Family
Actinide  
Actinide  
CAS Number
7440133  
99+
7440359  
99+
Space Group Name
I4/mmm  
P63/mmc  
Space Group Number
139.00  
11
194.00  
7
Facts
Interesting Facts
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
  
  • Americium metal is produced by bombarding Plutonium with Neutrons.
  • Americium metal was discovered as a by-product while testing an atomic bomb (Manhattan Project).
  
Sources
Found in Uranium Ores, Mining, Ores of metals  
Obtained By Bombarding Plutonium with Neutrons  
History
  
  
Who Discovered
William Crookes  
Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso  
Discovery
In 1900  
In 1944  
Abundance
  
  
Abundance In Universe
0.00 %  
17
0.00 %  
35
Abundance In Sun
0.00 %  
26
0.00 %  
30
Abundance In Meteorites
-  
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
0.00 %  
99+
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
  • Americium metal is used in smoke detection alarms.
  • In the future, this metal has a potential to be used in batteries of spacecrafts.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
-  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
Highly Toxic  
Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,568.00 °C  
21
994.00 °C  
99+
Boiling Point
4,027.00 °C  
12
2,607.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Silvery White  
Luster
Metallic  
-  
Hardness
  
  
Mohs Hardness
5.00  
8
6.00  
6
Brinell Hardness
125.00 MPa  
99+
260.00 MPa  
99+
Vickers Hardness
220.00 MPa  
99+
600.00 MPa  
28
Speed of Sound
12,400.00 m/s  
3
2,750.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.60  
33
1.30  
99+
Reflectivity
60.00 %  
23
64.00 %  
19
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Pa  
Am  
Isotopes
  
  
Known Isotopes
27  
12
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.50  
28
1.30  
33
Sanderson Electronegativity
1.50  
18
1.30  
25
Allred Rochow Electronegativity
1.14  
29
1.20  
28
Mulliken-Jaffe Electronegativity
1.50  
26
1.30  
33
Allen Electronegativity
1.50  
32
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.50  
27
2.70  
22
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol  
99+
578.00 kJ/mol  
99+
2nd Energy Level
1,128.00 kJ/mol  
99+
1,158.00 kJ/mol  
99+
3rd Energy Level
1,814.00 kJ/mol  
99+
2,132.00 kJ/mol  
99+
4th Energy Level
2,991.00 kJ/mol  
99+
3,493.00 kJ/mol  
99+
5th Energy Level
5,120.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
6th Energy Level
5,680.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
7th Energy level
5,680.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
8th Energy Level
5,680.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
9th Energy Level
5,120.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
10th Energy Level
5,120.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
11th Energy Level
5,680.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
12th Energy Level
5,680.00 kJ/mol  
99+
62,400.00 kJ/mol  
11
13th Energy Level
5,680.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
14th Energy Level
5,680.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
15th Energy Level
56,800.00 kJ/mol  
99+
62,400.00 kJ/mol  
39
16th Energy Level
56,800.00 kJ/mol  
99+
57,800.00 kJ/mol  
99+
17th Energy Level
568.50 kJ/mol  
99+
578.00 kJ/mol  
99+
18th Energy Level
5,680.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
19th Energy Level
568.30 kJ/mol  
99+
578.00 kJ/mol  
99+
20th Energy Level
568.00 kJ/mol  
99+
578.00 kJ/mol  
99+
21st Energy Level
568.00 kJ/mol  
99+
5,780.00 kJ/mol  
22
22nd Energy Level
568.00 kJ/mol  
99+
578.00 kJ/mol  
99+
23rd Energy Level
568.00 kJ/mol  
99+
5,780.00 kJ/mol  
23
24th Energy Level
568.00 kJ/mol  
99+
578.00 kJ/mol  
99+
25th Energy Level
568.00 kJ/mol  
99+
578.00 kJ/mol  
99+
26th Energy Level
568.00 kJ/mol  
99+
578.00 kJ/mol  
99+
27th Energy Level
568.00 kJ/mol  
99+
578.00 kJ/mol  
99+
28th Energy Level
568.00 kJ/mol  
99+
578.00 kJ/mol  
99+
29th Energy Level
568.00 kJ/mol  
99+
578.00 kJ/mol  
99+
30th Energy Level
568.00 kJ/mol  
99+
578.00 kJ/mol  
99+
Electrochemical Equivalent
1.72 g/amp-hr  
99+
3.02 g/amp-hr  
20
Electron Work Function
5.89 eV  
3
4.30 eV  
25
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
91  
27
95  
23
Electron Configuration
[Rn] 5f2 6d1 7s2  
[Rn] 5f7 7s2  
Crystal Structure
Tetragonal (TETR)  
Double Hexagonal Close Packed (DHCP)  
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100  
DHCP-Crystal-Structure-of-Americium.jpg#100  
Atom
  
  
Number of Protons
91  
27
95  
23
Number of Neutrons
122  
22
148  
13
Number of Electrons
91  
27
95  
23
Radius of an Atom
  
  
Atomic Radius
163.00 pm  
27
173.00 pm  
23
Covalent Radius
200.00 pm  
11
180.00 pm  
23
Van der Waals Radius
243.00 pm  
15
244.00 pm  
14
Atomic Weight
231.04 amu  
24
243.00 amu  
20
Atomic Volume
15.00 cm3/mol  
99+
17.86 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Thorium
  
Plutonium
  
Next Element
Uranium
  
Curium
  
Valence Electron Potential
92.00 (-eV)  
11
44.00 (-eV)  
99+
Lattice Constant
392.50 pm  
26
346.81 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.58  
36
1.58  
34
Mechanical
Density
  
  
Density At Room Temperature
15.37 g/cm3  
20
12.00 g/cm3  
32
Density When Liquid (at m.p.)
15.37 g/cm3  
21
13.67 g/cm3  
26
Tensile Strength
80.00 MPa  
29
80.00 MPa  
29
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
13
Vapor Pressure at 2000 K
0.00 (Pa)  
32
0.00 (Pa)  
24
Elasticity properties
  
  
Shear Modulus
16.00 GPa  
99+
26.00 GPa  
36
Bulk Modulus
47.00 GPa  
26
44.00 GPa  
32
Young's Modulus
47.00 GPa  
99+
58.00 GPa  
36
Poisson Ratio
0.23  
30
0.30  
14
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
15.37  
23
13.67  
26
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
10
0.00 H/m  
16
Susceptibility
0.00  
21
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
177.00 nΩ·m  
21
0.69 nΩ·m  
99+
Electrical Conductivity
0.05 106/cm Ω  
39
0.02 106/cm Ω  
99+
Electron Affinity
53.03 kJ/mol  
22
63.90 kJ/mol  
18
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.11 J/(kg K)  
99+
Molar Heat Capacity
27.20 J/mol·K  
24
62.70 J/mol·K  
1
Thermal Conductivity
47.00 W/m·K  
32
10.00 W/m·K  
99+
Critical Temperature
1,841.00 K  
25
1,449.00 K  
99+
Thermal Expansion
9.90 µm/(m·K)  
99+
13.60 µm/(m·K)  
32
Enthalpy
  
  
Enthalpy of Vaporization
481.00 kJ/mol  
17
161.00 kJ/mol  
99+
Enthalpy of Fusion
12.34 kJ/mol  
34
14.39 kJ/mol  
27
Enthalpy of Atomization
481.90 kJ/mol  
19
268.00 kJ/mol  
99+
Standard Molar Entropy
198.10 J/mol.K  
1
63.10 J/mol.K  
23
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