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Strontium vs Cobalt

Strontium
Cobalt
Cobalt vs Strontium


Periodic Table
Symbol
Sr  
Co  
Group Number
2  
16
9  
9
Period Number
5  
4  
Block
s block  
d block  
Element Family
Alkaline Earth  
Transition Metal  
CAS Number
7440246  
99+
7440484  
38
Space Group Name
Fm_ 3m  
P63/mmc  
Space Group Number
225.00  
3
194.00  
7
Facts
Interesting Facts
  • Strontium element is softer than Calcium.
  • Silvery Strontium turns yellow, if exposed to air.
  
  • The main source of Cobalt is as a by-product of copper and nickel metal mining.
  • Cobalt metal can be obtained from other elements like Oxygen, Sulfur and Arsenic.
  • It s also used in electroplating process as it exhibits anti cession properties.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Found in Compounds, Mining, Ores of Minerals  
History
  
  
Who Discovered
William Cruickshank  
Georg Brandt  
Discovery
In 1787  
In 1732  
Abundance
  
  
Abundance In Universe
0.00 %  
15
0.00 %  
10
Abundance In Sun
0.00 %  
15
0.00 %  
9
Abundance In Meteorites
0.00 %  
15
0.06 %  
10
Abundance In Earth's Crust
0.04 %  
10
0.00 %  
21
Abundance In Oceans
0.00 %  
4
0.00 %  
20
Abundance In Humans
0.00 %  
8
0.00 %  
20
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.
  
  • Its alloys with aluminum and nickel are used to make powerful magnets.
  • Few other alloys exhibit high-temperature strength and hence they are used in Turbines of Jet and Gas engine.
  
Industrial Uses
Ammunition Industry, Chemical Industry  
Chemical Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
Pharmaceutical Industry  
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
0.04 Blood/mg dm-3  
18
In Bone
140.00 p.p.m.  
7
0.04 p.p.m.  
32
Physical
Melting Point
769.00 °C  
99+
1,495.00 °C  
29
Boiling Point
1,384.00 °C  
99+
2,870.00 °C  
35
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Gray  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
1.50  
19
5.00  
8
Brinell Hardness
110.00 MPa  
99+
470.00 MPa  
31
Vickers Hardness
15.00 MPa  
99+
1,043.00 MPa  
18
Speed of Sound
4,170.00 m/s  
23
4,720.00 m/s  
18
Optical Properties
  
  
Refractive Index
1.43  
39
2.50  
5
Reflectivity
65.00 %  
18
67.00 %  
16
Allotropes
No  
Yes  
α Allotropes
-  
α-Cobalt  
β Allotropes
-  
β-Cobalt  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Sr  
Co  
Isotopes
  
  
Known Isotopes
27  
12
26  
13
Electronegativity
  
  
Pauling Electronegativity
0.95  
99+
1.88  
13
Sanderson Electronegativity
0.72  
99+
2.56  
1
Allred Rochow Electronegativity
0.99  
38
1.70  
6
Mulliken-Jaffe Electronegativity
1.00  
99+
1.88  
14
Allen Electronegativity
0.96  
99+
1.84  
13
Electropositivity
  
  
Pauling Electropositivity
3.05  
7
2.12  
99+
Ionization Energies
  
  
1st Energy Level
549.50 kJ/mol  
99+
760.40 kJ/mol  
19
2nd Energy Level
1,064.20 kJ/mol  
99+
1,648.00 kJ/mol  
32
3rd Energy Level
4,138.00 kJ/mol  
10
3,232.00 kJ/mol  
22
4th Energy Level
5,500.00 kJ/mol  
22
4,950.00 kJ/mol  
29
5th Energy Level
6,910.00 kJ/mol  
30
7,670.00 kJ/mol  
18
6th Energy Level
8,760.00 kJ/mol  
26
9,840.00 kJ/mol  
18
7th Energy level
10,230.00 kJ/mol  
19
12,440.00 kJ/mol  
11
8th Energy Level
11,800.00 kJ/mol  
19
15,230.00 kJ/mol  
12
9th Energy Level
15,600.00 kJ/mol  
17
17,959.00 kJ/mol  
13
10th Energy Level
17,100.00 kJ/mol  
19
26,570.00 kJ/mol  
7
11th Energy Level
31,270.00 kJ/mol  
6
29,400.00 kJ/mol  
8
12th Energy Level
5,490.00 kJ/mol  
99+
32,400.00 kJ/mol  
30
13th Energy Level
5,490.00 kJ/mol  
99+
36,600.00 kJ/mol  
8
14th Energy Level
5,490.00 kJ/mol  
99+
39,700.00 kJ/mol  
9
15th Energy Level
54,900.00 kJ/mol  
99+
42,800.00 kJ/mol  
99+
16th Energy Level
54,900.00 kJ/mol  
99+
49,396.00 kJ/mol  
99+
17th Energy Level
549.50 kJ/mol  
99+
52,737.00 kJ/mol  
13
18th Energy Level
5,490.00 kJ/mol  
99+
134,810.00 kJ/mol  
1
19th Energy Level
549.50 kJ/mol  
99+
145,170.00 kJ/mol  
2
20th Energy Level
549.00 kJ/mol  
99+
154,700.00 kJ/mol  
4
21st Energy Level
549.50 kJ/mol  
99+
167,400.00 kJ/mol  
4
22nd Energy Level
549.00 kJ/mol  
99+
178,100.00 kJ/mol  
3
23rd Energy Level
549.50 kJ/mol  
99+
189,300.00 kJ/mol  
3
24th Energy Level
549.50 kJ/mol  
99+
760.40 kJ/mol  
17
25th Energy Level
549.00 kJ/mol  
99+
760.40 kJ/mol  
17
26th Energy Level
549.50 kJ/mol  
99+
760.40 kJ/mol  
17
27th Energy Level
549.50 kJ/mol  
99+
760.40 kJ/mol  
16
28th Energy Level
549.50 kJ/mol  
99+
760.40 kJ/mol  
22
29th Energy Level
549.50 kJ/mol  
99+
760.40 kJ/mol  
23
30th Energy Level
549.50 kJ/mol  
99+
760.40 kJ/mol  
17
Electrochemical Equivalent
1.64 g/amp-hr  
99+
1.10 g/amp-hr  
99+
Electron Work Function
2.59 eV  
99+
5.00 eV  
9
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Chemical Stability, Ionization  
Atomic
Atomic Number
38  
99+
22  
99+
Electron Configuration
[Kr] 5s2  
[Ar] 3d2 4s2  
Crystal Structure
Face Centered Cubic (FCC)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
FCC-Crystal-Structure-of-Strontium.jpg#100  
HCP-Crystal-Structure-of-Cobalt.jpg#100  
Atom
  
  
Number of Protons
38  
99+
22  
99+
Number of Neutrons
50  
99+
26  
99+
Number of Electrons
38  
99+
22  
99+
Radius of an Atom
  
  
Atomic Radius
215.00 pm  
6
147.00 pm  
36
Covalent Radius
195.00 pm  
15
160.00 pm  
32
Van der Waals Radius
249.00 pm  
11
200.00 pm  
35
Atomic Weight
87.62 amu  
99+
47.87 amu  
99+
Atomic Volume
33.70 cm3/mol  
9
10.64 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Rubidium
  
Iron
  
Next Element
Yttrium
  
Nickel
  
Valence Electron Potential
25.70 (-eV)  
99+
95.20 (-eV)  
10
Lattice Constant
608.49 pm  
6
295.08 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.57  
40
1.26  
99+
Mechanical
Density
  
  
Density At Room Temperature
2.64 g/cm3  
99+
4.51 g/cm3  
99+
Density When Liquid (at m.p.)
2.38 g/cm3  
99+
4.11 g/cm3  
99+
Tensile Strength
170.00 MPa  
21
434.00 MPa  
10
Viscosity
0.00  
2
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
121.00 (Pa)  
1
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
38
0.98 (Pa)  
14
Elasticity properties
  
  
Shear Modulus
6.03 GPa  
99+
44.00 GPa  
17
Bulk Modulus
11.00 GPa  
99+
110.00 GPa  
15
Young's Modulus
15.70 GPa  
99+
116.00 GPa  
20
Poisson Ratio
0.28  
17
0.32  
12
Other Mechanical Properties
-  
Ductile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
2.64  
99+
4,500.00  
1
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
17
Susceptibility
0.00  
35
0.00  
3
Electrical Properties
  
  
Electrical Property
-  
Poor Conductor  
Resistivity
132.00 nΩ·m  
24
420.00 nΩ·m  
12
Electrical Conductivity
0.08 106/cm Ω  
31
0.02 106/cm Ω  
99+
Electron Affinity
5.03 kJ/mol  
99+
7.60 kJ/mol  
99+
Thermal
Specific Heat
0.30 J/(kg K)  
18
0.52 J/(kg K)  
9
Molar Heat Capacity
26.40 J/mol·K  
36
25.06 J/mol·K  
99+
Thermal Conductivity
35.40 W/m·K  
38
21.90 W/m·K  
99+
Critical Temperature
1,050.00 K  
99+
1,768.00 K  
32
Thermal Expansion
22.50 µm/(m·K)  
19
8.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
150.00 kJ/mol  
99+
429.00 kJ/mol  
20
Enthalpy of Fusion
9.16 kJ/mol  
99+
15.48 kJ/mol  
19
Enthalpy of Atomization
163.20 kJ/mol  
99+
468.60 kJ/mol  
20
Standard Molar Entropy
55.00 J/mol.K  
34
27.30 J/mol.K  
99+
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