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Bohrium vs Americium

Bohrium
Americium
Americium vs Bohrium


Periodic Table
Symbol
Bh  
Am  
Group Number
7  
11
10  
8
Period Number
7  
7  
Block
d block  
f block  
Element Family
Transition Metal  
Actinide  
CAS Number
54037148  
12
7440359  
99+
Space Group Name
-  
P63/mmc  
Space Group Number
276.00  
1
194.00  
7
Facts
Interesting Facts
  • Bohrium metal is also known as Unnilseptium (Uns) and Nielsbohrium (Ns).
  
  • 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 Minerals, Mining, Synthetically Produced  
Obtained By Bombarding Plutonium with Neutrons  
History
  
  
Who Discovered
Gesellschaft für Schwerionenforschung  
Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso  
Discovery
In 1981  
In 1944  
Abundance
  
  
Abundance In Universe
0.00 %  
37
0.00 %  
35
Abundance In Sun
-  
0.00 %  
30
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
Uses
Uses & Benefits
  • Currently known uses of Bohrium 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
Research Purposes  
Alloys, Nuclear Research, 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  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
-  
994.00 °C  
99+
Boiling Point
0.00 °C  
99+
2,607.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
-  
Silvery White  
Luster
Unknown Luster  
-  
Hardness
  
  
Mohs Hardness
7.00  
3
6.00  
6
Brinell Hardness
270.00 MPa  
99+
260.00 MPa  
99+
Vickers Hardness
2,700.00 MPa  
4
600.00 MPa  
28
Speed of Sound
2,680.00 m/s  
99+
2,750.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.50  
36
1.30  
99+
Reflectivity
59.00 %  
24
64.00 %  
19
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Bh  
Am  
Isotopes
  
  
Known Isotopes
5  
32
16  
23
Electronegativity
  
  
Pauling Electronegativity
2.00  
8
1.30  
33
Sanderson Electronegativity
1.30  
25
1.30  
25
Allred Rochow Electronegativity
1.30  
25
1.20  
28
Mulliken-Jaffe Electronegativity
1.30  
33
1.30  
33
Allen Electronegativity
2.00  
6
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.00  
99+
2.70  
22
Ionization Energies
  
  
1st Energy Level
742.90 kJ/mol  
23
578.00 kJ/mol  
99+
2nd Energy Level
1,688.50 kJ/mol  
31
1,158.00 kJ/mol  
99+
3rd Energy Level
2,566.50 kJ/mol  
99+
2,132.00 kJ/mol  
99+
4th Energy Level
3,598.90 kJ/mol  
99+
3,493.00 kJ/mol  
99+
5th Energy Level
4,727.80 kJ/mol  
99+
5,780.00 kJ/mol  
99+
6th Energy Level
5,991.70 kJ/mol  
99+
5,780.00 kJ/mol  
99+
7th Energy level
7,226.80 kJ/mol  
34
5,780.00 kJ/mol  
99+
8th Energy Level
7,100.00 kJ/mol  
33
5,780.00 kJ/mol  
99+
9th Energy Level
5,800.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
10th Energy Level
7,100.00 kJ/mol  
35
5,780.00 kJ/mol  
99+
11th Energy Level
8,200.00 kJ/mol  
25
5,780.00 kJ/mol  
99+
12th Energy Level
82,700.00 kJ/mol  
4
62,400.00 kJ/mol  
11
13th Energy Level
7,100.00 kJ/mol  
29
5,780.00 kJ/mol  
99+
14th Energy Level
8,200.00 kJ/mol  
17
5,780.00 kJ/mol  
99+
15th Energy Level
82,000.00 kJ/mol  
14
62,400.00 kJ/mol  
39
16th Energy Level
71,100.00 kJ/mol  
20
57,800.00 kJ/mol  
99+
17th Energy Level
820.00 kJ/mol  
31
578.00 kJ/mol  
99+
18th Energy Level
8,200.00 kJ/mol  
20
5,780.00 kJ/mol  
99+
19th Energy Level
820.80 kJ/mol  
28
578.00 kJ/mol  
99+
20th Energy Level
820.00 kJ/mol  
21
578.00 kJ/mol  
99+
21st Energy Level
8,200.00 kJ/mol  
11
5,780.00 kJ/mol  
22
22nd Energy Level
820.00 kJ/mol  
16
578.00 kJ/mol  
99+
23rd Energy Level
8,200.00 kJ/mol  
8
5,780.00 kJ/mol  
23
24th Energy Level
820.00 kJ/mol  
12
578.00 kJ/mol  
99+
25th Energy Level
820.00 kJ/mol  
10
578.00 kJ/mol  
99+
26th Energy Level
820.00 kJ/mol  
10
578.00 kJ/mol  
99+
27th Energy Level
820.00 kJ/mol  
9
578.00 kJ/mol  
99+
28th Energy Level
820.00 kJ/mol  
15
578.00 kJ/mol  
99+
29th Energy Level
820.00 kJ/mol  
14
578.00 kJ/mol  
99+
30th Energy Level
820.00 kJ/mol  
10
578.00 kJ/mol  
99+
Electrochemical Equivalent
3.00 g/amp-hr  
21
3.02 g/amp-hr  
20
Electron Work Function
4.90 eV  
12
4.30 eV  
25
Other Chemical Properties
Ionization, Radioactive Isotopes  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
107  
11
95  
23
Electron Configuration
[Rn] 5f14 6d5 7s2  
[Rn] 5f7 7s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Double Hexagonal Close Packed (DHCP)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
DHCP-Crystal-Structure-of-Americium.jpg#100  
Atom
  
  
Number of Protons
107  
11
95  
23
Number of Neutrons
155  
9
148  
13
Number of Electrons
107  
11
95  
23
Radius of an Atom
  
  
Atomic Radius
128.00 pm  
99+
173.00 pm  
23
Covalent Radius
141.00 pm  
99+
180.00 pm  
23
Van der Waals Radius
0.00 pm  
99+
244.00 pm  
14
Atomic Weight
270.00 amu  
8
243.00 amu  
20
Atomic Volume
23.70 cm3/mol  
14
17.86 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Seaborgium
  
Plutonium
  
Next Element
Hassium
  
Curium
  
Valence Electron Potential
27.20 (-eV)  
99+
44.00 (-eV)  
99+
Lattice Constant
-  
346.81 pm  
99+
Lattice Angles
-  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.57  
99+
1.58  
34
Mechanical
Density
  
  
Density At Room Temperature
37.10 g/cm3  
3
12.00 g/cm3  
32
Density When Liquid (at m.p.)
37.10 g/cm3  
3
13.67 g/cm3  
26
Tensile Strength
152.00 MPa  
24
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)  
37
0.00 (Pa)  
24
Elasticity properties
  
  
Shear Modulus
28.00 GPa  
32
26.00 GPa  
36
Bulk Modulus
37.00 GPa  
99+
44.00 GPa  
32
Young's Modulus
0.00 GPa  
99+
58.00 GPa  
36
Poisson Ratio
0.35  
9
0.30  
14
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
37.00  
5
13.67  
26
Magnetic Ordering
-  
Paramagnetic  
Permeability
0.00 H/m  
11
0.00 H/m  
16
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
6.50 nΩ·m  
99+
0.69 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.02 106/cm Ω  
99+
Electron Affinity
-  
63.90 kJ/mol  
18
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.11 J/(kg K)  
99+
Molar Heat Capacity
37.10 J/mol·K  
2
62.70 J/mol·K  
1
Thermal Conductivity
37.00 W/m·K  
36
10.00 W/m·K  
99+
Critical Temperature
1,323.00 K  
99+
1,449.00 K  
99+
Thermal Expansion
14.30 µm/(m·K)  
28
13.60 µm/(m·K)  
32
Enthalpy
  
  
Enthalpy of Vaporization
270.50 kJ/mol  
99+
161.00 kJ/mol  
99+
Enthalpy of Fusion
-  
14.39 kJ/mol  
27
Enthalpy of Atomization
-  
268.00 kJ/mol  
99+
Standard Molar Entropy
57.00 J/mol.K  
30
63.10 J/mol.K  
23
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