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Americium vs Nihonium

Americium
Nihonium
Nihonium vs Americium


Periodic Table
Symbol
Am  
Nh  
Group Number
10  
8
13  
5
Period Number
7  
7  
Block
f block  
p block  
Element Family
Actinide  
Probably Post-​Transition  
CAS Number
7440359  
99+
54084707  
6
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
194.00  
7
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).
  
Nihonium is a synthetic chemical element and is highly radioactive.  
Sources
Obtained By Bombarding Plutonium with Neutrons  
Synthetically Produced  
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso  
Joint Institute for Nuclear Research and Lawrence Livermore National Laboratory  
Discovery
In 1944  
In 2003  
Abundance
  
  
Abundance In Universe
0.00 %  
35
0.00 %  
40
Abundance In Sun
0.00 %  
30
-  
Abundance In Meteorites
0.00 %  
99+
-  
Abundance In Earth's Crust
0.00 %  
99+
-  
Abundance In Oceans
-  
-  
Abundance In Humans
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 Ununtrium metal are limited to research purpose only.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
Alloys, Nuclear Research, Research Purposes  
Research Purposes  
Biological Properties
  
  
Toxicity
Toxic  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
29
In Bone
0.00 p.p.m.  
99+
0.20 p.p.m.  
27
Physical
Melting Point
994.00 °C  
99+
430.00 °C  
99+
Boiling Point
2,607.00 °C  
99+
1,130.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
-  
Luster
-  
Unknown Luster  
Hardness
  
  
Mohs Hardness
6.00  
6
-  
Brinell Hardness
260.00 MPa  
99+
600.00 MPa  
24
Vickers Hardness
600.00 MPa  
28
350.00 MPa  
99+
Speed of Sound
2,750.00 m/s  
99+
3,600.00 m/s  
29
Optical Properties
  
  
Refractive Index
1.30  
99+
1.30  
99+
Reflectivity
64.00 %  
19
60.00 %  
23
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Am  
Nh  
Isotopes
  
  
Known Isotopes
16  
23
7  
31
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.30  
33
Sanderson Electronegativity
1.30  
25
1.90  
13
Allred Rochow Electronegativity
1.20  
28
1.30  
25
Mulliken-Jaffe Electronegativity
1.30  
33
1.00  
99+
Allen Electronegativity
1.30  
40
0.70  
99+
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.20  
39
Ionization Energies
  
  
1st Energy Level
578.00 kJ/mol  
99+
704.90 kJ/mol  
34
2nd Energy Level
1,158.00 kJ/mol  
99+
2,238.50 kJ/mol  
7
3rd Energy Level
2,132.00 kJ/mol  
99+
3,023.30 kJ/mol  
26
4th Energy Level
3,493.00 kJ/mol  
99+
4,351.50 kJ/mol  
39
5th Energy Level
5,780.00 kJ/mol  
99+
5,692.60 kJ/mol  
99+
6th Energy Level
5,780.00 kJ/mol  
99+
7,000.00 kJ/mol  
99+
7th Energy level
5,780.00 kJ/mol  
99+
7,040.00 kJ/mol  
40
8th Energy Level
5,780.00 kJ/mol  
99+
7,040.00 kJ/mol  
36
9th Energy Level
5,780.00 kJ/mol  
99+
7,040.00 kJ/mol  
33
10th Energy Level
5,780.00 kJ/mol  
99+
7,040.00 kJ/mol  
37
11th Energy Level
5,780.00 kJ/mol  
99+
7,040.00 kJ/mol  
35
12th Energy Level
62,400.00 kJ/mol  
11
70,000.00 kJ/mol  
5
13th Energy Level
5,780.00 kJ/mol  
99+
7,000.00 kJ/mol  
34
14th Energy Level
5,780.00 kJ/mol  
99+
7,000.00 kJ/mol  
24
15th Energy Level
62,400.00 kJ/mol  
39
70,000.00 kJ/mol  
30
16th Energy Level
57,800.00 kJ/mol  
99+
70,000.00 kJ/mol  
25
17th Energy Level
578.00 kJ/mol  
99+
540.00 kJ/mol  
99+
18th Energy Level
5,780.00 kJ/mol  
99+
3,200.00 kJ/mol  
99+
19th Energy Level
578.00 kJ/mol  
99+
540.20 kJ/mol  
99+
20th Energy Level
578.00 kJ/mol  
99+
700.00 kJ/mol  
36
21st Energy Level
5,780.00 kJ/mol  
22
1,130.00 kJ/mol  
29
22nd Energy Level
578.00 kJ/mol  
99+
558.00 kJ/mol  
99+
23rd Energy Level
5,780.00 kJ/mol  
23
7,000.00 kJ/mol  
11
24th Energy Level
578.00 kJ/mol  
99+
700.00 kJ/mol  
29
25th Energy Level
578.00 kJ/mol  
99+
0.00 kJ/mol  
99+
26th Energy Level
578.00 kJ/mol  
99+
586.20 kJ/mol  
99+
27th Energy Level
578.00 kJ/mol  
99+
704.90 kJ/mol  
28
28th Energy Level
578.00 kJ/mol  
99+
704.90 kJ/mol  
33
29th Energy Level
578.00 kJ/mol  
99+
704.90 kJ/mol  
34
30th Energy Level
578.00 kJ/mol  
99+
704.00 kJ/mol  
28
Electrochemical Equivalent
3.02 g/amp-hr  
20
3.00 g/amp-hr  
21
Electron Work Function
4.30 eV  
25
4.90 eV  
12
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Chemical Stability, Ionization  
Atomic
Atomic Number
95  
23
113  
5
Electron Configuration
[Rn] 5f7 7s2  
[Rn] 5f14 6d10 7s2 7p1  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Not Known  
Crystal Lattice
DHCP-Crystal-Structure-of-Americium.jpg#100  
Unknown-Crystal-Structure-of-Ununtrium.jpg#100  
Atom
  
  
Number of Protons
95  
23
113  
5
Number of Neutrons
148  
13
150  
12
Number of Electrons
95  
23
113  
5
Radius of an Atom
  
  
Atomic Radius
173.00 pm  
23
170.00 pm  
24
Covalent Radius
180.00 pm  
23
170.00 pm  
27
Van der Waals Radius
244.00 pm  
14
320.00 pm  
3
Atomic Weight
243.00 amu  
20
286.00 amu  
4
Atomic Volume
17.86 cm3/mol  
99+
21.10 cm3/mol  
24
Adjacent Atomic Numbers
  
  
Previous Element
Plutonium
  
Copernicium
  
Next Element
Curium
  
Flerovium
  
Valence Electron Potential
44.00 (-eV)  
99+
6.20 (-eV)  
99+
Lattice Constant
346.81 pm  
99+
0.00 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.58  
34
1.58  
35
Mechanical
Density
  
  
Density At Room Temperature
12.00 g/cm3  
32
16.00 g/cm3  
19
Density When Liquid (at m.p.)
13.67 g/cm3  
26
16.00 g/cm3  
19
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)  
13
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
24
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
26.00 GPa  
36
40.00 GPa  
19
Bulk Modulus
44.00 GPa  
32
0.00 GPa  
99+
Young's Modulus
58.00 GPa  
36
12.20 GPa  
99+
Poisson Ratio
0.30  
14
0.30  
14
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
13.67  
26
16.00  
21
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
16
0.00 H/m  
5
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
0.69 nΩ·m  
99+
0.32 nΩ·m  
99+
Electrical Conductivity
0.02 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
63.90 kJ/mol  
18
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.11 J/(kg K)  
99+
0.12 J/(kg K)  
99+
Molar Heat Capacity
62.70 J/mol·K  
1
27.00 J/mol·K  
29
Thermal Conductivity
10.00 W/m·K  
99+
1.70 W/m·K  
99+
Critical Temperature
1,449.00 K  
99+
700.00 K  
99+
Thermal Expansion
13.60 µm/(m·K)  
32
6.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
161.00 kJ/mol  
99+
410.80 kJ/mol  
23
Enthalpy of Fusion
14.39 kJ/mol  
27
-  
Enthalpy of Atomization
268.00 kJ/mol  
99+
320.70 kJ/mol  
99+
Standard Molar Entropy
63.10 J/mol.K  
23
65.00 J/mol.K  
17
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