Osmium Strontium Comparison
Periodic Table
Symbol
Os
Sr
Group Number
8
10
2
16
Period Number
6
5
Block
d block
s block
Element Family
Transition Metal
Alkaline Earth
CAS Number
7440042
99+
7440246
99+
Space Group Name
P63/mmc
Fm_ 3m
Space Group Number
194.00
5
225.00
2
Facts
Interesting Facts
- Osmium metal does not oxidize in air unless it is heated.
- But if it heated den it forms Osmium Tetroxide, which is highly toxic.
- Strontium element is softer than Calcium.
- Silvery Strontium turns yellow, if exposed to air.
Sources
Found As a By-product, Found in Minerals, Mining
Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Smithson Tennant
William Cruickshank
Discovery
In 1803
In 1787
Abundance
Abundance In Universe
3 * 10-7 %
21
4 * 10-6 %
14
Abundance In Sun
~0.0000002 %
25
~0.000005 %
15
Abundance In Meteorites
0.00 %
28
0.00 %
15
Abundance In Earth's Crust
0.00 %
99+
0.04 %
10
Abundance In Oceans
Not Available
0.00 %
4
Abundance In Humans
Not Available
0.00 %
7
Uses
Uses & Benefits
- Its has very limited uses and its alloys are very hard and are used in the manufacturing of pen tips, pivots, needles and electrical contacts.
- It is also used as industrial catalyst to speed up the chemical reaction.
- 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.
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry
Ammunition Industry, Chemical Industry
Medical Uses
NA
NA
Other Uses
Alloys
Alloys
Biological Properties
Toxicity
Highly Toxic
Non Toxic
Present in Human Body
No
Yes
In Blood
Not Available
0.03 Blood/mg dm-3
19
In Bone
Not Available
140.00 p.p.m.
7
Physical Properties
Melting Point
3,045.00 °C
3
769.00 °C
99+
Boiling Point
5,027.00 °C
6
1,384.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silvery Bluish-Gray
Silvery White
Luster
Metallic
Metallic
Hardness
Mohs Hardness
7.00
3
1.50
18
Brinell Hardness
3,490.00 MPa
1
Not Available
Speed of Sound
4,940.00 m/s
11
Not Available
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
Os
Sr
Isotopes
Known Isotopes
35
4
27
12
Electronegativity
Pauling Electronegativity
2.20
4
0.95
99+
Sanderson Electronegativity
Not Available
0.72
27
Allred Rochow Electronegativity
1.52
12
0.99
37
Mulliken-Jaffe Electronegativity
Not Available
1.00
18
Allen Electronegativity
1.65
19
0.96
40
Electropositivity
Pauling Electropositivity
1.80
99+
3.05
7
Ionization Energies
1st Energy Level
840.00 kJ/mol
12
549.50 kJ/mol
99+
2nd Energy Level
1,309.80 kJ/mol
99+
1,064.20 kJ/mol
99+
3rd Energy Level
1,600.00 kJ/mol
99+
4,138.00 kJ/mol
10
4th Energy Level
Not Available
5,500.00 kJ/mol
13
5th Energy Level
Not Available
6,910.00 kJ/mol
18
6th Energy Level
Not Available
8,760.00 kJ/mol
18
7th Energy level
Not Available
10,230.00 kJ/mol
19
8th Energy Level
Not Available
11,800.00 kJ/mol
19
9th Energy Level
Not Available
15,600.00 kJ/mol
17
10th Energy Level
Not Available
17,100.00 kJ/mol
19
11th Energy Level
Not Available
31,270.00 kJ/mol
6
Electrochemical Equivalent
1.77 g/amp-hr
38
1.64 g/amp-hr
99+
Electron Work Function
4.83 eV
8
2.59 eV
99+
Other Chemical Properties
Chemical Stability, Ionization, Solubility
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
76
40
38
99+
Electron Configuration
[Xe] 4f14 5d6 6s2
[Kr] 5s2
Crystal Structure
Hexagonal Close Packed (HCP)
Face Centered Cubic (FCC)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
FCC-Crystal-Structure-of-Strontium.jpg#100
Atom
Number of Protons
76
39
38
99+
Number of Neutrons
114
25
50
99+
Number of Electrons
76
39
38
99+
Radius of an Atom
Atomic Radius
133.80 pm
99+
215.00 pm
5
Covalent Radius
Not Available
195.00 pm
15
Van der Waals Radius
216.00 pm
24
249.00 pm
7
Atomic Weight
190.23 amu
35
87.62 amu
99+
Atomic Volume
8.49 cm3/mol
99+
33.70 cm3/mol
6
Adjacent Atomic Numbers
Valence Electron Potential
91.40 (-eV)
12
25.70 (-eV)
99+
Lattice Constant
273.44 pm
99+
608.49 pm
6
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, π/2
Lattice C/A Ratio
1.58
14
Not Available
Mechanical Properties
Density
Density At Room Temperature
22.59 g/cm3
9
2.64 g/cm3
99+
Density When Liquid (at m.p.)
20.00 g/cm3
1
2.38 g/cm3
99+
Tensile Strength
1,000.00 MPa
4
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
Not Available
121.00 (Pa)
1
Vapor Pressure at 2000 K
0.00 (Pa)
28
Not Available
Elasticity properties
Shear Modulus
222.00 GPa
1
6.03 GPa
99+
Bulk Modulus
462.00 GPa
1
Not Available
Young's Modulus
Not Available
15.70 GPa
99+
Poisson Ratio
0.25
24
0.28
17
Other Mechanical Properties
Ductile
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
22.57
2
2.64
99+
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
NA
Resistivity
81.20 nΩ·m
35
132.00 nΩ·m
24
Electrical Conductivity
0.11 106/cm Ω
18
0.08 106/cm Ω
26
Electron Affinity
106.10 kJ/mol
9
5.03 kJ/mol
38
Thermal Properties
Specific Heat
0.13 J/(kg K)
39
0.30 J/(kg K)
18
Molar Heat Capacity
24.70 J/mol·K
99+
26.40 J/mol·K
28
Thermal Conductivity
87.60 W/m·K
19
35.40 W/m·K
37
Critical Temperature
Not Available
Not Available
Thermal Expansion
5.10 µm/(m·K)
99+
22.50 µm/(m·K)
18
Enthalpy
Enthalpy of Vaporization
627.60 kJ/mol
7
150.00 kJ/mol
99+
Enthalpy of Fusion
29.30 kJ/mol
4
9.16 kJ/mol
38
Enthalpy of Atomization
669.00 kJ/mol
6
163.20 kJ/mol
99+
Standard Molar Entropy
32.60 J/mol.K
99+
55.00 J/mol.K
26
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