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Americium vs Neptunium

Americium
Neptunium
Neptunium vs Americium


Periodic Table
Symbol
Am  
Np  
Group Number
10  
8
3  
15
Period Number
7  
7  
Block
f block  
f block  
Element Family
Actinide  
Actinide  
CAS Number
7440359  
99+
7439998  
99+
Space Group Name
P63/mmc  
Pnma  
Space Group Number
194.00  
7
62.00  
14
Facts
Interesting Facts
  • Americium metal is produced by bombarding Plutonium with Neutrons.
  • Americium metal was discovered as a by-product while testing an atomic bomb (Manhattan Project).
  
Neptunium was the first transuranium element to be discovered.  
Sources
Obtained By Bombarding Plutonium with Neutrons  
Made by Bombarding Uranium with Neutrons, Ores of metals  
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso  
Edwin McMillan and Philip H. Abelson  
Discovery
In 1944  
In 1940  
Abundance
  
  
Abundance In Universe
0.00 %  
35
0.00 %  
40
Abundance In Sun
0.00 %  
30
0.00 %  
26
Abundance In Meteorites
0.00 %  
99+
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
-  
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Americium metal is used in smoke detection alarms.
  • In the future, this metal has a potential to be used in batteries of spacecrafts.
  
  • Currently known uses of Neptunium metal are limited to research purpose only.
  • Neptunium’s isotope neptunium-237 is used as a neutron detectors.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
Alloys, Nuclear Research, Research Purposes  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
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
994.00 °C  
99+
640.00 °C  
99+
Boiling Point
2,607.00 °C  
99+
3,902.00 °C  
13
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silver  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
6.00  
6
Brinell Hardness
260.00 MPa  
99+
622.00 MPa  
23
Vickers Hardness
600.00 MPa  
28
640.00 MPa  
23
Speed of Sound
2,750.00 m/s  
99+
2,260.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.30  
99+
1.30  
99+
Reflectivity
64.00 %  
19
64.00 %  
19
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Am  
Np  
Isotopes
  
  
Known Isotopes
16  
23
20  
19
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.36  
30
Sanderson Electronegativity
1.30  
25
1.36  
23
Allred Rochow Electronegativity
1.20  
28
1.22  
27
Mulliken-Jaffe Electronegativity
1.30  
33
1.36  
31
Allen Electronegativity
1.30  
40
1.36  
37
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.64  
25
Ionization Energies
  
  
1st Energy Level
578.00 kJ/mol  
99+
604.50 kJ/mol  
99+
2nd Energy Level
1,158.00 kJ/mol  
99+
1,128.00 kJ/mol  
99+
3rd Energy Level
2,132.00 kJ/mol  
99+
1,997.00 kJ/mol  
99+
4th Energy Level
3,493.00 kJ/mol  
99+
3,242.00 kJ/mol  
99+
5th Energy Level
5,780.00 kJ/mol  
99+
6,180.00 kJ/mol  
99+
6th Energy Level
5,780.00 kJ/mol  
99+
5,785.00 kJ/mol  
99+
7th Energy level
5,780.00 kJ/mol  
99+
6,040.00 kJ/mol  
99+
8th Energy Level
5,780.00 kJ/mol  
99+
6,040.00 kJ/mol  
99+
9th Energy Level
5,780.00 kJ/mol  
99+
6,180.00 kJ/mol  
99+
10th Energy Level
5,780.00 kJ/mol  
99+
6,180.00 kJ/mol  
99+
11th Energy Level
5,780.00 kJ/mol  
99+
6,180.00 kJ/mol  
99+
12th Energy Level
62,400.00 kJ/mol  
11
61,800.00 kJ/mol  
13
13th Energy Level
5,780.00 kJ/mol  
99+
6,180.00 kJ/mol  
40
14th Energy Level
5,780.00 kJ/mol  
99+
6,180.00 kJ/mol  
29
15th Energy Level
62,400.00 kJ/mol  
39
60,600.00 kJ/mol  
99+
16th Energy Level
57,800.00 kJ/mol  
99+
60,420.00 kJ/mol  
31
17th Energy Level
578.00 kJ/mol  
99+
604.00 kJ/mol  
99+
18th Energy Level
5,780.00 kJ/mol  
99+
6,040.00 kJ/mol  
99+
19th Energy Level
578.00 kJ/mol  
99+
604.50 kJ/mol  
99+
20th Energy Level
578.00 kJ/mol  
99+
604.00 kJ/mol  
99+
21st Energy Level
5,780.00 kJ/mol  
22
6,040.00 kJ/mol  
17
22nd Energy Level
578.00 kJ/mol  
99+
604.00 kJ/mol  
40
23rd Energy Level
5,780.00 kJ/mol  
23
6,040.00 kJ/mol  
18
24th Energy Level
578.00 kJ/mol  
99+
604.50 kJ/mol  
99+
25th Energy Level
578.00 kJ/mol  
99+
604.00 kJ/mol  
99+
26th Energy Level
578.00 kJ/mol  
99+
604.00 kJ/mol  
99+
27th Energy Level
578.00 kJ/mol  
99+
604.00 kJ/mol  
99+
28th Energy Level
578.00 kJ/mol  
99+
604.00 kJ/mol  
99+
29th Energy Level
578.00 kJ/mol  
99+
604.00 kJ/mol  
99+
30th Energy Level
578.00 kJ/mol  
99+
604.00 kJ/mol  
99+
Electrochemical Equivalent
3.02 g/amp-hr  
20
1.77 g/amp-hr  
99+
Electron Work Function
4.30 eV  
25
4.90 eV  
12
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
95  
23
93  
25
Electron Configuration
[Rn] 5f7 7s2  
[Rn] 5f4 6d1 7s2  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Orthorhombic (ORTH)  
Crystal Lattice
DHCP-Crystal-Structure-of-Americium.jpg#100  
ORTH-Crystal-Structure-of-Neptunium.jpg#100  
Atom
  
  
Number of Protons
95  
23
93  
25
Number of Neutrons
148  
13
144  
15
Number of Electrons
95  
23
93  
25
Radius of an Atom
  
  
Atomic Radius
173.00 pm  
23
155.00 pm  
32
Covalent Radius
180.00 pm  
23
190.00 pm  
18
Van der Waals Radius
244.00 pm  
14
221.00 pm  
27
Atomic Weight
243.00 amu  
20
237.00 amu  
22
Atomic Volume
17.86 cm3/mol  
99+
11.62 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Plutonium
  
Uranium
  
Next Element
Curium
  
Plutonium
  
Valence Electron Potential
44.00 (-eV)  
99+
96.00 (-eV)  
9
Lattice Constant
346.81 pm  
99+
666.30 pm  
3
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.58  
34
1.43  
99+
Mechanical
Density
  
  
Density At Room Temperature
12.00 g/cm3  
32
19.38 g/cm3  
14
Density When Liquid (at m.p.)
13.67 g/cm3  
26
20.25 g/cm3  
10
Tensile Strength
80.00 MPa  
29
125.00 MPa  
26
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
13
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
24
0.11 (Pa)  
17
Elasticity properties
  
  
Shear Modulus
26.00 GPa  
36
5.60 GPa  
99+
Bulk Modulus
44.00 GPa  
32
180.00 GPa  
9
Young's Modulus
58.00 GPa  
36
46.00 GPa  
99+
Poisson Ratio
0.30  
14
0.26  
22
Other Mechanical Properties
-  
Ductile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
13.67  
26
20.25  
15
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
16
0.00 H/m  
6
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
0.69 nΩ·m  
99+
1.22 nΩ·m  
99+
Electrical Conductivity
0.02 106/cm Ω  
99+
0.01 106/cm Ω  
99+
Electron Affinity
63.90 kJ/mol  
18
118.60 kJ/mol  
6
Thermal
Specific Heat
0.11 J/(kg K)  
99+
0.12 J/(kg K)  
99+
Molar Heat Capacity
62.70 J/mol·K  
1
29.46 J/mol·K  
10
Thermal Conductivity
10.00 W/m·K  
99+
6.30 W/m·K  
99+
Critical Temperature
1,449.00 K  
99+
913.00 K  
99+
Thermal Expansion
13.60 µm/(m·K)  
32
13.30 µm/(m·K)  
35
Enthalpy
  
  
Enthalpy of Vaporization
161.00 kJ/mol  
99+
336.00 kJ/mol  
39
Enthalpy of Fusion
14.39 kJ/mol  
27
3.20 kJ/mol  
99+
Enthalpy of Atomization
268.00 kJ/mol  
99+
275.30 kJ/mol  
99+
Standard Molar Entropy
63.10 J/mol.K  
23
64.00 J/mol.K  
21
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