Actinium vs Indium
Periodic Table
Symbol
Ac
In
Group Number
Not Available
13
5
Period Number
7
5
Block
f block
p block
Element Family
Actinide
Post-Transition
CAS Number
7440348
99+
7440746
17
Space Group Name
Fm_ 3m
I4/mmm
Space Group Number
225.00
2
139.00
8
Facts
Interesting Facts
Not Available
- 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 Treating Radium with Neutrons, Ores of metals
Mining, Ores of metals
History
Who Discovered
Friedrich Oskar Giesel
Ferdinand Reich and Hieronymous Theodor Richter
Discovery
In 1902
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
- Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
- 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
1,227.00 °C
38
156.61 °C
99+
Boiling Point
3,200.00 °C
26
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
Ac
In
Isotopes
Known Isotopes
29
10
35
4
Electronegativity
Pauling Electronegativity
1.10
99+
1.78
16
Sanderson Electronegativity
Not Available
2.14
8
Allred Rochow Electronegativity
1.00
36
1.49
13
Mulliken-Jaffe Electronegativity
Not Available
1.76
10
Allen Electronegativity
Not Available
1.66
18
Electropositivity
Pauling Electropositivity
2.90
10
2.22
38
Ionization Energies
1st Energy Level
499.00 kJ/mol
99+
558.30 kJ/mol
99+
2nd Energy Level
1,170.00 kJ/mol
99+
1,820.70 kJ/mol
18
3rd Energy Level
1,900.00 kJ/mol
99+
2,704.00 kJ/mol
39
4th Energy Level
4,700.00 kJ/mol
23
5,210.00 kJ/mol
17
Electrochemical Equivalent
2.82 g/amp-hr
18
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
89
29
49
99+
Electron Configuration
[Rn] 6d1 7s2
[Kr] 4d10 5s2 5p1
Crystal Structure
Face Centered Cubic (FCC)
Tetragonal (TETR)
Crystal Lattice
FCC-Crystal-Structure-of-Actinium.jpg#100
TETR-Crystal-Structure-of-Indium.jpg#100
Atom
Number of Protons
89
29
49
99+
Number of Neutrons
138
16
66
99+
Number of Electrons
89
29
49
99+
Radius of an Atom
Atomic Radius
195.00 pm
7
167.00 pm
24
Covalent Radius
Not Available
142.00 pm
99+
Van der Waals Radius
Not Available
193.00 pm
31
Atomic Weight
227.00 amu
25
114.82 amu
99+
Atomic Volume
22.54 cm3/mol
11
15.70 cm3/mol
33
Adjacent Atomic Numbers
Valence Electron Potential
38.60 (-eV)
99+
54.00 (-eV)
25
Lattice Constant
567.00 pm
8
325.23 pm
99+
Lattice Angles
π/2, π/2, π/2
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
10.00 g/cm3
37
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
Not Available
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
10.07
28
7.31
99+
Magnetic Ordering
Paramagnetic
Diamagnetic
Electrical Properties
Electrical Property
Unknown
Conductor
Resistivity
Not Available
83.70 nΩ·m
34
Electrical Conductivity
Not Available
0.12 106/cm Ω
17
Electron Affinity
Not Available
28.90 kJ/mol
31
Thermal Properties
Specific Heat
0.12 J/(kg K)
40
0.23 J/(kg K)
27
Molar Heat Capacity
27.20 J/mol·K
18
26.74 J/mol·K
25
Thermal Conductivity
12.00 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
Not Available
3.28 kJ/mol
99+
Enthalpy of Atomization
301.00 kJ/mol
36
242.70 kJ/mol
99+
Standard Molar Entropy
56.50 J/mol.K
25
57.80 J/mol.K
22
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