Strontium vs Iridium
Periodic Table
Symbol
Sr
Ir
Group Number
2
16
9
9
Period Number
5
6
Block
s block
d block
Element Family
Alkaline Earth
Transition Metal
CAS Number
7440246
99+
7439885
99+
Space Group Name
Fm_ 3m
Fm_ 3m
Space Group Number
225.00
2
225.00
2
Facts
Interesting Facts
- Strontium element is softer than Calcium.
- Silvery Strontium turns yellow, if exposed to air.
- Iridium element occurs as natural alloys of Platinum and Osmium.
- Iridium element is known as the most corrosion resistance metal .
Sources
Found in Minerals, Mining, Ores of Minerals
Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
William Cruickshank
Smithson Tennant
Discovery
In 1787
In 1803
Abundance
Abundance In Universe
4 * 10-6 %
14
2 * 10-7 %
22
Abundance In Sun
~0.000005 %
15
~0.0000002 %
25
Abundance In Meteorites
0.00 %
15
0.00 %
29
Abundance In Earth's Crust
0.04 %
10
0.00 %
99+
Abundance In Oceans
0.00 %
4
Not Available
Abundance In Humans
0.00 %
7
Not Available
Uses
Uses & Benefits
- Strontium metal is used to producing ferrite magnets as well as refining zinc.
- By-product of nuclear reactors called Strontium-90 is a radioactive isotope; it is absorbed by tissues and destroys bone marrow and cancer growth.
- 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
Ammunition Industry, Chemical Industry
Automobile Industry, Electrical Industry, Electronic Industry
Medical Uses
NA
NA
Other Uses
Alloys
Alloys
Biological Properties
Toxicity
Non Toxic
Toxic
Present in Human Body
Yes
Yes
In Blood
0.03 Blood/mg dm-3
19
Not Available
In Bone
140.00 p.p.m.
7
Not Available
Physical Properties
Melting Point
769.00 °C
99+
2,410.00 °C
7
Boiling Point
1,384.00 °C
99+
4,527.00 °C
10
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silvery White
Luster
Metallic
Metallic
Hardness
Mohs Hardness
1.50
18
6.50
5
Brinell Hardness
Not Available
1,670.00 MPa
5
Vickers Hardness
Not Available
1,760.00 MPa
3
Speed of Sound
Not Available
4,825.00 m/s
13
Optical Properties
Reflectivity
Not Available
78.00 %
6
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
Sr
Ir
Isotopes
Known Isotopes
27
12
34
5
Electronegativity
Pauling Electronegativity
0.95
99+
2.20
4
Sanderson Electronegativity
0.72
27
Not Available
Allred Rochow Electronegativity
0.99
37
1.55
11
Mulliken-Jaffe Electronegativity
1.00
18
Not Available
Allen Electronegativity
0.96
40
1.68
17
Electropositivity
Pauling Electropositivity
3.05
7
1.80
99+
Ionization Energies
1st Energy Level
549.50 kJ/mol
99+
880.00 kJ/mol
9
2nd Energy Level
1,064.20 kJ/mol
99+
1,600.00 kJ/mol
35
3rd Energy Level
4,138.00 kJ/mol
10
Not Available
4th Energy Level
5,500.00 kJ/mol
13
Not Available
5th Energy Level
6,910.00 kJ/mol
18
Not Available
6th Energy Level
8,760.00 kJ/mol
18
Not Available
7th Energy level
10,230.00 kJ/mol
19
Not Available
8th Energy Level
11,800.00 kJ/mol
19
Not Available
9th Energy Level
15,600.00 kJ/mol
17
Not Available
10th Energy Level
17,100.00 kJ/mol
19
Not Available
11th Energy Level
31,270.00 kJ/mol
6
Not Available
Electrochemical Equivalent
1.64 g/amp-hr
99+
1.14 g/amp-hr
99+
Electron Work Function
2.59 eV
99+
4.55 eV
13
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Flammable, Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
38
99+
77
39
Electron Configuration
[Kr] 5s2
[Xe] 4f14 5d7 6s2
Crystal Structure
Face Centered Cubic (FCC)
Face Centered Cubic (FCC)
Crystal Lattice
FCC-Crystal-Structure-of-Strontium.jpg#100
FCC-Crystal-Structure-of-Iridium.jpg#100
Atom
Number of Protons
38
99+
74
99+
Number of Neutrons
50
99+
110
27
Number of Electrons
38
99+
74
99+
Radius of an Atom
Atomic Radius
215.00 pm
5
136.00 pm
99+
Covalent Radius
195.00 pm
15
141.00 pm
99+
Van der Waals Radius
249.00 pm
7
202.00 pm
27
Atomic Weight
87.62 amu
99+
192.22 amu
34
Atomic Volume
33.70 cm3/mol
6
9.53 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
25.70 (-eV)
99+
140.00 (-eV)
5
Lattice Constant
608.49 pm
6
383.90 pm
26
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
2.64 g/cm3
99+
22.56 g/cm3
10
Density When Liquid (at m.p.)
2.38 g/cm3
99+
19.00 g/cm3
3
Tensile Strength
Not Available
2,000.00 MPa
2
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
121.00 (Pa)
1
Not Available
Vapor Pressure at 2000 K
Not Available
0.00 (Pa)
25
Elasticity properties
Shear Modulus
6.03 GPa
99+
210.00 GPa
2
Bulk Modulus
Not Available
320.00 GPa
3
Young's Modulus
15.70 GPa
99+
528.00 GPa
1
Poisson Ratio
0.28
17
0.26
22
Other Mechanical Properties
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
2.64
99+
21.78
3
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
NA
Conductor
Resistivity
132.00 nΩ·m
24
47.10 nΩ·m
99+
Electrical Conductivity
0.08 106/cm Ω
26
0.19 106/cm Ω
10
Electron Affinity
5.03 kJ/mol
38
151.00 kJ/mol
4
Thermal Properties
Specific Heat
0.30 J/(kg K)
18
0.13 J/(kg K)
39
Molar Heat Capacity
26.40 J/mol·K
28
25.10 J/mol·K
99+
Thermal Conductivity
35.40 W/m·K
37
147.00 W/m·K
10
Critical Temperature
Not Available
Not Available
Thermal Expansion
22.50 µm/(m·K)
18
6.40 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
150.00 kJ/mol
99+
799.10 kJ/mol
1
Enthalpy of Fusion
9.16 kJ/mol
38
35.23 kJ/mol
1
Enthalpy of Atomization
163.20 kJ/mol
99+
837.00 kJ/mol
1
Standard Molar Entropy
55.00 J/mol.K
26
35.50 J/mol.K
99+
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