Symbol
Po
Ir
Group Number
169
0
17
👆🏻
Period Number
66
2
7
👆🏻
Block
p block
d block
Element Family
Post-Transition
Transition Metal
CAS Number
74400867439885
7429905
54386242
👆🏻
Space Group Name
Pm-3m
Fm_ 3m
Space Group Number
221.00225.00
11
276
👆🏻
Interesting Facts
- Polonium was the first radioactive element to be discovered.
- Polonium element and its compounds are highly radioactive.
- Its alloy with Beryllium provides source of neutrons.
- Iridium element occurs as natural alloys of Platinum and Osmium.
- Iridium element is known as the most corrosion resistance metal .
Sources
Mining, Ores of metals
Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Pierre Curie and Marie Curie
Smithson Tennant
Discovery
In 1898
In 1803
Abundance
Abundance In Universe
0.00 %0.00 %
0
0.11
👆🏻
Abundance In Sun
-0.00 %
0
0.1
👆🏻
Abundance In Meteorites
-0.00 %
0
22
👆🏻
Abundance In Earth's Crust
0.00 %0.00 %
1E-37
8.1
👆🏻
Abundance In Oceans
0.00 %-
0
1.1
👆🏻
Abundance In Humans
0.00 %0.00 %
0
1.4
👆🏻
Uses & Benefits
- Polonium metal has different Allotropes, it is used in antistatic devices and for research purpose.
- A 1 gram of Polonium can reach a temperature of 500°C, hence it is used as a heat source for space equipment.
- 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.
Industrial Uses
Aerospace Industry, Ammunition Industry
Automobile Industry, Electrical Industry, Electronic Industry
Medical Uses
-
-
Other Uses
Alloys
Alloys
Biological Properties
Toxicity
Highly Toxic
Toxic
Present in Human Body
✔
✘
✔
✘
In Blood
0.00 Blood/mg dm-30.00 Blood/mg dm-3
0
1970
👆🏻
In Bone
0.00 p.p.m.0.00 p.p.m.
0
170000
👆🏻
Melting Point
254.00 °C2,410.00 °C
-38.83
3410
👆🏻
Boiling Point
962.00 °C4,527.00 °C
0
5660
👆🏻
Appearance
Physical State
Solid
Solid
Color
Silver
Silvery White
Luster
-
Metallic
Hardness
Mohs Hardness
2.506.50
0.2
8.5
👆🏻
Brinell Hardness
70.00 MPa1,670.00 MPa
0.14
3490
👆🏻
Vickers Hardness
30.00 MPa1,760.00 MPa
0
3920
👆🏻
Speed of Sound
2,260.00 m/s4,825.00 m/s
818
16200
👆🏻
Optical Properties
Refractive Index
2.702.40
0.155
3.41
👆🏻
Reflectivity
50.00 %78.00 %
5
97
👆🏻
Allotropes
✔
✘
✔
✘
α Allotropes
α-polonium
-
β Allotropes
β-polonium
-
γ Allotropes
-
-
Chemical Formula
Po
Ir
Isotopes
Known Isotopes
2934
0
38
👆🏻
Electronegativity
Pauling Electronegativity
2.002.20
0
2.6
👆🏻
Sanderson Electronegativity
2.002.20
0.22
2.56
👆🏻
Allred Rochow Electronegativity
1.761.55
0.86
1.9
👆🏻
Mulliken-Jaffe Electronegativity
2.482.20
0.62
2.48
👆🏻
Allen Electronegativity
2.191.68
0.659
2.7
👆🏻
Electropositivity
Pauling Electropositivity
2.001.80
1.46
3.3
👆🏻
Ionization Energies
1st Energy Level
812.10 kJ/mol880.00 kJ/mol
375.7
26130
👆🏻
2nd Energy Level
1,833.20 kJ/mol1,600.00 kJ/mol
392.8
28750
👆🏻
3rd Energy Level
812.10 kJ/mol2,256.10 kJ/mol
392.8
34230
👆🏻
4th Energy Level
8,121.00 kJ/mol880.00 kJ/mol
375.7
37066
👆🏻
5th Energy Level
8,120.00 kJ/mol8,800.00 kJ/mol
392
97510
👆🏻
6th Energy Level
8,120.00 kJ/mol8,800.00 kJ/mol
1007
105800
👆🏻
7th Energy level
8,120.00 kJ/mol8,800.00 kJ/mol
1007
114300
👆🏻
8th Energy Level
8,120.00 kJ/mol8,800.00 kJ/mol
730
125300
👆🏻
9th Energy Level
8,120.00 kJ/mol8,800.00 kJ/mol
1007
134700
👆🏻
10th Energy Level
8,120.00 kJ/mol8,800.00 kJ/mol
392
144300
👆🏻
11th Energy Level
8,120.00 kJ/mol8,800.00 kJ/mol
392
169988
👆🏻
12th Energy Level
8,120.00 kJ/mol8,800.00 kJ/mol
0
189368
👆🏻
13th Energy Level
8,120.00 kJ/mol8,800.00 kJ/mol
1007
76015
👆🏻
14th Energy Level
8,120.00 kJ/mol8,800.00 kJ/mol
380
86450
👆🏻
15th Energy Level
81,200.00 kJ/mol88,000.00 kJ/mol
33000
100700
👆🏻
16th Energy Level
81,200.00 kJ/mol88,000.00 kJ/mol
375.7
109480
👆🏻
17th Energy Level
812.10 kJ/mol880.00 kJ/mol
375.7
122200
👆🏻
18th Energy Level
8,120.00 kJ/mol8,800.00 kJ/mol
0
134810
👆🏻
19th Energy Level
812.10 kJ/mol880.00 kJ/mol
375.7
148700
👆🏻
20th Energy Level
812.00 kJ/mol880.00 kJ/mol
0
171200
👆🏻
21st Energy Level
812.10 kJ/mol880.00 kJ/mol
375.7
179100
👆🏻
22nd Energy Level
812.00 kJ/mol880.00 kJ/mol
330
184900
👆🏻
23rd Energy Level
812.10 kJ/mol8,800.00 kJ/mol
357.6
198800
👆🏻
24th Energy Level
812.10 kJ/mol880.00 kJ/mol
297.3
195200
👆🏻
25th Energy Level
812.10 kJ/mol880.00 kJ/mol
0
121900
👆🏻
26th Energy Level
812.10 kJ/mol880.00 kJ/mol
357.6
127700
👆🏻
27th Energy Level
812.10 kJ/mol880.00 kJ/mol
0
133800
👆🏻
28th Energy Level
812.10 kJ/mol880.00 kJ/mol
297.3
139800
👆🏻
29th Energy Level
812.10 kJ/mol880.00 kJ/mol
0
148100
👆🏻
30th Energy Level
812.00 kJ/mol880.00 kJ/mol
0
154500
👆🏻
Electrochemical Equivalent
3.90 g/amp-hr1.14 g/amp-hr
0.16812
8.3209
👆🏻
Electron Work Function
4.50 eV4.55 eV
2.14
6
👆🏻
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility
Flammable, Ionization, Radioactive Isotopes, Radioactivity
Atomic Number
8477
3
117
👆🏻
Electron Configuration
[Xe] 4f14 5d10 6s2 6p4
[Xe] 4f14 5d7 6s2
Crystal Structure
Monoclinic (MON)
Face Centered Cubic (FCC)
Crystal Lattice
Atom
Number of Protons
8474
3
117
👆🏻
Number of Neutrons
125110
4
285
👆🏻
Number of Electrons
8474
3
117
👆🏻
Radius of an Atom
Atomic Radius
168.00 pm136.00 pm
0
348
👆🏻
Covalent Radius
140.00 pm141.00 pm
0
260
👆🏻
Van der Waals Radius
197.00 pm202.00 pm
0
348
👆🏻
Atomic Weight
209.00 amu192.22 amu
6.94
294
👆🏻
Atomic Volume
22.23 cm3/mol9.53 cm3/mol
1.39
71.07
👆🏻
Adjacent Atomic Numbers
Previous Element
Next Element
Valence Electron Potential
9.30 (-eV)140.00 (-eV)
0
392.42
👆🏻
Lattice Constant
335.90 pm383.90 pm
0
891.25
👆🏻
Lattice Angles
π/2, π/2, π/2
π/2, π/2, π/2
Lattice C/A Ratio
1.461.58
0.423
1.9
👆🏻
Density
Density At Room Temperature
9.20 g/cm322.56 g/cm3
0.534
40.7
👆🏻
Density When Liquid (at m.p.)
9.40 g/cm319.00 g/cm3
0.512
41
👆🏻
Tensile Strength
50.00 MPa2,000.00 MPa
0.1
11000
👆🏻
Viscosity
0.000.00
1.5E-05
0.0035
👆🏻
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)0.00 (Pa)
0
121
👆🏻
Vapor Pressure at 2000 K
0.00 (Pa)0.00 (Pa)
0
774
👆🏻
Elasticity properties
Shear Modulus
24.00 GPa210.00 GPa
1.3
222
👆🏻
Bulk Modulus
46.00 GPa320.00 GPa
0
462
👆🏻
Young's Modulus
46.00 GPa528.00 GPa
0
528
👆🏻
Poisson Ratio
0.230.26
0.032
0.47
👆🏻
Other Mechanical Properties
-
-
Magnetic Characteristics
Specific Gravity
9.3221.78
0.53
4500
👆🏻
Magnetic Ordering
Nonmagnetic
Paramagnetic
Permeability
0.00 H/m0.00 H/m
1.25643E-06
0.0063
👆🏻
Susceptibility
0.000.00
-0.000166
200000
👆🏻
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
0.40 nΩ·m47.10 nΩ·m
0.1
961
👆🏻
Electrical Conductivity
0.02 106/cm Ω0.19 106/cm Ω
0
0.63
👆🏻
Electron Affinity
183.30 kJ/mol151.00 kJ/mol
0
222.8
👆🏻
Specific Heat
0.12 J/(kg K)0.13 J/(kg K)
0.1
3.6
👆🏻
Molar Heat Capacity
26.40 J/mol·K25.10 J/mol·K
13.1
62.7
👆🏻
Thermal Conductivity
20.00 W/m·K147.00 W/m·K
0
429
👆🏻
Critical Temperature
527.00 K2,719.00 K
26.3
3695
👆🏻
Thermal Expansion
23.50 µm/(m·K)6.40 µm/(m·K)
4.5
97
👆🏻
Enthalpy
Enthalpy of Vaporization
60.30 kJ/mol799.10 kJ/mol
7.32
799.1
👆🏻
Enthalpy of Fusion
13.00 kJ/mol35.23 kJ/mol
2.1
35.23
👆🏻
Enthalpy of Atomization
134.00 kJ/mol837.00 kJ/mol
61.5
837
👆🏻
Standard Molar Entropy
41.10 J/mol.K35.50 J/mol.K
9.5
198.1
👆🏻