Iridium vs Potassium
Periodic Table
Symbol
Ir
K
Group Number
9
9
1
17
Period Number
6
4
Block
d block
s block
Element Family
Transition Metal
Alkali
CAS Number
7439885
99+
7440097
99+
Space Group Name
Fm_ 3m
Im_ 3m
Space Group Number
225.00
2
229.00
1
Facts
Interesting Facts
- Iridium element occurs as natural alloys of Platinum and Osmium.
- Iridium element is known as the most corrosion resistance metal .
- In the list of most abundant element Potassium is ranked 7th.
- Potassium can easily be sliced (chopped) down using knife.
Sources
Found in Minerals, Mining, Ores of Minerals
Found in Minerals, Mining
History
Who Discovered
Smithson Tennant
Humphry Davy
Discovery
In 1803
In 1807
Abundance
Abundance In Universe
2 * 10-7 %
22
3 * 10-4 %
9
Abundance In Sun
~0.0000002 %
25
~0.0004 %
9
Abundance In Meteorites
0.00 %
29
0.07 %
9
Abundance In Earth's Crust
0.00 %
99+
1.50 %
6
Abundance In Oceans
Not Available
0.04 %
3
Abundance In Humans
Not Available
0.20 %
2
Uses
Uses & Benefits
- Iridium has an anti corrosion properties and it is used in special alloy with Osmium metal and that alloy is used in pen tips and compass bearings.
- Potassium’s compounds are in high demand for their application in Fertilizer manufacturing.
- Potassium carbonate is used in glass manufacturing and Potassium carbonate in manufacturing detergent and body wash.
Industrial Uses
Automobile Industry, Electrical Industry, Electronic Industry
Ammunition Industry, Chemical Industry
Medical Uses
NA
Pharmaceutical Industry
Other Uses
Alloys
NA
Biological Properties
Toxicity
Toxic
Toxic
Present in Human Body
Yes
Yes
In Blood
Not Available
1,620.00 Blood/mg dm-3
2
In Bone
Not Available
2,100.00 p.p.m.
3
Physical Properties
Melting Point
2,410.00 °C
7
63.65 °C
99+
Boiling Point
4,527.00 °C
10
774.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silvery Gray
Luster
Metallic
NA
Hardness
Mohs Hardness
6.50
5
0.40
23
Brinell Hardness
1,670.00 MPa
5
0.36 MPa
99+
Vickers Hardness
1,760.00 MPa
3
Not Available
Speed of Sound
4,825.00 m/s
13
2,000.00 m/s
99+
Optical Properties
Reflectivity
78.00 %
6
Not Available
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
Ir
K
Isotopes
Known Isotopes
34
5
20
19
Electronegativity
Pauling Electronegativity
2.20
4
0.82
99+
Sanderson Electronegativity
Not Available
0.45
31
Allred Rochow Electronegativity
1.55
11
0.91
39
Mulliken-Jaffe Electronegativity
Not Available
0.73
23
Allen Electronegativity
1.68
17
0.73
99+
Electropositivity
Pauling Electropositivity
1.80
99+
3.18
3
Ionization Energies
1st Energy Level
880.00 kJ/mol
9
418.80 kJ/mol
99+
2nd Energy Level
1,600.00 kJ/mol
35
3,052.00 kJ/mol
5
3rd Energy Level
Not Available
4,420.00 kJ/mol
8
4th Energy Level
Not Available
5,877.00 kJ/mol
9
5th Energy Level
Not Available
7,975.00 kJ/mol
8
6th Energy Level
Not Available
9,590.00 kJ/mol
13
7th Energy level
Not Available
11,343.00 kJ/mol
17
8th Energy Level
Not Available
14,944.00 kJ/mol
13
9th Energy Level
Not Available
16,963.70 kJ/mol
15
10th Energy Level
Not Available
48,610.00 kJ/mol
3
11th Energy Level
Not Available
54,490.00 kJ/mol
4
12th Energy Level
Not Available
60,730.00 kJ/mol
4
13th Energy Level
Not Available
68,950.00 kJ/mol
4
14th Energy Level
Not Available
75,900.00 kJ/mol
5
15th Energy Level
Not Available
83,080.00 kJ/mol
6
16th Energy Level
Not Available
93,400.00 kJ/mol
7
17th Energy Level
Not Available
99,710.00 kJ/mol
8
Electrochemical Equivalent
1.14 g/amp-hr
99+
1.46 g/amp-hr
99+
Electron Work Function
4.55 eV
13
2.30 eV
99+
Other Chemical Properties
Flammable, Ionization, Radioactive Isotopes, Radioactivity
Chemical Stability, Flammability, Ionization, Solubility
Atomic Properties
Atomic Number
77
39
19
99+
Electron Configuration
[Xe] 4f14 5d7 6s2
[Ar] 4s1
Crystal Structure
Face Centered Cubic (FCC)
Body Centered Cubic (BCC)
Crystal Lattice
FCC-Crystal-Structure-of-Iridium.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
74
99+
19
99+
Number of Neutrons
110
27
20
99+
Number of Electrons
74
99+
19
99+
Radius of an Atom
Atomic Radius
136.00 pm
99+
227.00 pm
3
Covalent Radius
141.00 pm
99+
203.00 pm
9
Van der Waals Radius
202.00 pm
27
275.00 pm
5
Atomic Weight
192.22 amu
34
39.10 amu
99+
Atomic Volume
9.53 cm3/mol
99+
45.46 cm3/mol
3
Adjacent Atomic Numbers
Valence Electron Potential
140.00 (-eV)
5
10.40 (-eV)
99+
Lattice Constant
383.90 pm
26
532.80 pm
12
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
22.56 g/cm3
10
0.86 g/cm3
99+
Density When Liquid (at m.p.)
19.00 g/cm3
3
0.83 g/cm3
99+
Tensile Strength
2,000.00 MPa
2
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 2000 K
0.00 (Pa)
25
Not Available
Elasticity properties
Shear Modulus
210.00 GPa
2
1.30 GPa
99+
Bulk Modulus
320.00 GPa
3
3.10 GPa
99+
Young's Modulus
528.00 GPa
1
3.53 GPa
99+
Poisson Ratio
0.26
22
Not Available
Other Mechanical Properties
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
21.78
3
0.86
99+
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
47.10 nΩ·m
99+
72.00 nΩ·m
37
Electrical Conductivity
0.19 106/cm Ω
10
0.14 106/cm Ω
14
Electron Affinity
151.00 kJ/mol
4
48.40 kJ/mol
22
Thermal Properties
Specific Heat
0.13 J/(kg K)
39
0.75 J/(kg K)
6
Molar Heat Capacity
25.10 J/mol·K
99+
29.60 J/mol·K
6
Thermal Conductivity
147.00 W/m·K
10
102.50 W/m·K
15
Critical Temperature
Not Available
2,223.00 K
3
Thermal Expansion
6.40 µm/(m·K)
99+
83.30 µm/(m·K)
3
Enthalpy
Enthalpy of Vaporization
799.10 kJ/mol
1
77.50 kJ/mol
99+
Enthalpy of Fusion
35.23 kJ/mol
1
2.32 kJ/mol
99+
Enthalpy of Atomization
837.00 kJ/mol
1
89.50 kJ/mol
99+
Standard Molar Entropy
35.50 J/mol.K
99+
64.70 J/mol.K
18
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