Americium Indium Comparison
Periodic Table
Symbol
Am
In
Group Number
Not Available
13
5
Period Number
7
5
Block
f block
p block
Element Family
Actinide
Post-Transition
CAS Number
7440359
99+
7440746
17
Space Group Name
P63/mmc
I4/mmm
Space Group Number
194.00
5
139.00
8
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).
- Luster of Indium is bright in nature.
- Reich and richer were looking for thallium in zinc metal and they discovered Indium metal.
Sources
Obtained By Bombarding Plutonium with Neutrons
Mining, Ores of metals
History
Who Discovered
Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso
Ferdinand Reich and Hieronymous Theodor Richter
Discovery
In 1944
In 1863
Abundance
Abundance In Universe
Not Available
3 * 10-8 %
28
Abundance In Sun
~-9999 %
~0.0000004 %
23
Abundance In Meteorites
Not Available
0.00 %
99+
Abundance In Earth's Crust
Not Available
0.00 %
99+
Abundance In Oceans
Not Available
0.00 %
99+
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.
- It is used to produce indium tin oxide (ITO), it is used in manufacturing touch screens, flat screen TVs and solar panels.
- Its nitride, phosphide and antimonide are used in transistors and microchips.
Industrial Uses
NA
Aerospace Industry, Automobile Industry
Medical Uses
NA
Medical Research
Other Uses
Alloys, Nuclear Research, Research Purposes
Alloys, In Nuclear Reactors
Biological Properties
Toxicity
Toxic
Non Toxic
Present in Human Body
No
Yes
In Blood
0.00 Blood/mg dm-3
37
Not Available
In Bone
0.00 p.p.m.
36
Not Available
Physical Properties
Melting Point
994.00 °C
99+
156.61 °C
99+
Boiling Point
2,607.00 °C
99+
2,000.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silvery Gray
Luster
NA
Lustrous
Hardness
Mohs Hardness
Not Available
1.20
20
Brinell Hardness
Not Available
8.80 MPa
99+
Speed of Sound
Not Available
1,215.00 m/s
99+
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
Am
In
Isotopes
Known Isotopes
16
23
35
4
Electronegativity
Pauling Electronegativity
1.30
32
1.78
16
Sanderson Electronegativity
Not Available
2.14
8
Allred Rochow Electronegativity
1.20
27
1.49
13
Mulliken-Jaffe Electronegativity
Not Available
1.76
10
Allen Electronegativity
Not Available
1.66
18
Electropositivity
Pauling Electropositivity
2.70
22
2.22
38
Ionization Energies
1st Energy Level
578.00 kJ/mol
99+
558.30 kJ/mol
99+
2nd Energy Level
1,158.00 kJ/mol
99+
1,820.70 kJ/mol
18
3rd Energy Level
2,132.00 kJ/mol
99+
2,704.00 kJ/mol
39
4th Energy Level
3,493.00 kJ/mol
99+
5,210.00 kJ/mol
17
Electrochemical Equivalent
3.02 g/amp-hr
17
1.43 g/amp-hr
99+
Electron Work Function
Not Available
4.12 eV
24
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
95
23
49
99+
Electron Configuration
[Rn] 5f7 7s2
[Kr] 4d10 5s2 5p1
Crystal Structure
Double Hexagonal Close Packed (DHCP)
Tetragonal (TETR)
Crystal Lattice
DHCP-Crystal-Structure-of-Americium.jpg#100
TETR-Crystal-Structure-of-Indium.jpg#100
Atom
Number of Protons
95
23
49
99+
Number of Neutrons
148
12
66
99+
Number of Electrons
95
23
49
99+
Radius of an Atom
Atomic Radius
173.00 pm
21
167.00 pm
24
Covalent Radius
180.00 pm
21
142.00 pm
99+
Van der Waals Radius
244.00 pm
10
193.00 pm
31
Atomic Weight
243.00 amu
20
114.82 amu
99+
Atomic Volume
17.86 cm3/mol
29
15.70 cm3/mol
33
Adjacent Atomic Numbers
Valence Electron Potential
44.00 (-eV)
40
54.00 (-eV)
25
Lattice Constant
346.81 pm
99+
325.23 pm
99+
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
12.00 g/cm3
30
7.31 g/cm3
99+
Density When Liquid (at m.p.)
Not Available
7.02 g/cm3
33
Tensile Strength
Not Available
2.50 MPa
21
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)
13
0.01 (Pa)
11
Elasticity properties
Young's Modulus
Not Available
11.00 GPa
99+
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
NA
Ductile, Malleable
Magnetic Properties
Magnetic Characteristics
Specific Gravity
13.67
15
7.31
99+
Magnetic Ordering
Paramagnetic
Diamagnetic
Electrical Properties
Electrical Property
Unknown
Conductor
Resistivity
0.69 nΩ·m
99+
83.70 nΩ·m
34
Electrical Conductivity
0.02 106/cm Ω
99+
0.12 106/cm Ω
17
Electron Affinity
Not Available
28.90 kJ/mol
31
Thermal Properties
Specific Heat
0.11 J/(kg K)
99+
0.23 J/(kg K)
27
Molar Heat Capacity
62.70 J/mol·K
1
26.74 J/mol·K
25
Thermal Conductivity
10.00 W/m·K
99+
81.80 W/m·K
21
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
32.10 µm/(m·K)
9
Enthalpy
Enthalpy of Vaporization
Not Available
226.40 kJ/mol
40
Enthalpy of Fusion
14.39 kJ/mol
24
3.28 kJ/mol
99+
Enthalpy of Atomization
268.00 kJ/mol
40
242.70 kJ/mol
99+
Standard Molar Entropy
Not Available
57.80 J/mol.K
22
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