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Strontium Chromium Comparison

Strontium
Chromium
Chromium Strontium comparison


Periodic Table
Symbol
Sr  
Cr  
Group Number
2  
16
6  
12
Period Number
5  
4  
Block
s block  
d block  
Element Family
Alkaline Earth  
Transition Metal  
CAS Number
7440246  
99+
7440473  
39
Space Group Name
Fm_ 3m  
Im_ 3m  
Space Group Number
225.00  
3
229.00  
2
Facts
Interesting Facts
  • Strontium element is softer than Calcium.
  • Silvery Strontium turns yellow, if exposed to air.
  
  • Chromium is highly reactive, hence it is not found free in nature.
  • Ores of Chromites mineral are the major source of Chromium metal.
  • Almost 90% leather tanning is done with the help of chromium.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Found in Minerals, Mining, Ores of metals, Ores of Minerals  
History
  
  
Who Discovered
William Cruickshank  
Louis Nicolas Vauquelin  
Discovery
In 1787  
In Between 1797 - 1798  
Abundance
  
  
Abundance In Universe
0.00 %  
15
0.00 %  
8
Abundance In Sun
0.00 %  
15
0.00 %  
7
Abundance In Meteorites
0.00 %  
15
0.30 %  
7
Abundance In Earth's Crust
0.04 %  
10
0.01 %  
13
Abundance In Oceans
0.00 %  
4
0.00 %  
16
Abundance In Humans
0.00 %  
8
0.00 %  
19
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.
  
  • It is used to harden the steel and produces a stainless steel and other various alloys.
  • It is also used to give proper finish to polished mirrors. Its chromium plates are used in bathroom fittings.
  
Industrial Uses
Ammunition Industry, Chemical Industry  
Automobile Industry, Chemical Industry  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
Non Toxic  
Highly Toxic  
Present in Human Body
Yes  
Yes  
In Blood
0.03 Blood/mg dm-3  
19
0.11 Blood/mg dm-3  
12
In Bone
140.00 p.p.m.  
7
0.33 p.p.m.  
25
Physical
Melting Point
769.00 °C  
99+
1,857.00 °C  
14
Boiling Point
1,384.00 °C  
99+
2,672.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silver  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
1.50  
19
8.50  
1
Brinell Hardness
110.00 MPa  
99+
687.00 MPa  
18
Vickers Hardness
15.00 MPa  
99+
1,060.00 MPa  
17
Speed of Sound
4,170.00 m/s  
23
5,940.00 m/s  
8
Optical Properties
  
  
Refractive Index
1.43  
39
2.97  
2
Reflectivity
65.00 %  
18
70.00 %  
13
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Sr  
Cr  
Isotopes
  
  
Known Isotopes
27  
12
21  
18
Electronegativity
  
  
Pauling Electronegativity
0.95  
99+
1.66  
19
Sanderson Electronegativity
0.72  
99+
1.66  
17
Allred Rochow Electronegativity
0.99  
38
1.56  
11
Mulliken-Jaffe Electronegativity
1.00  
99+
1.66  
19
Allen Electronegativity
0.96  
99+
1.65  
22
Electropositivity
  
  
Pauling Electropositivity
3.05  
7
2.34  
36
Ionization Energies
  
  
1st Energy Level
549.50 kJ/mol  
99+
26,130.00 kJ/mol  
1
2nd Energy Level
1,064.20 kJ/mol  
99+
28,750.00 kJ/mol  
1
3rd Energy Level
4,138.00 kJ/mol  
10
34,230.00 kJ/mol  
1
4th Energy Level
5,500.00 kJ/mol  
22
37,066.00 kJ/mol  
1
5th Energy Level
6,910.00 kJ/mol  
30
97,510.00 kJ/mol  
1
6th Energy Level
8,760.00 kJ/mol  
26
105,800.00 kJ/mol  
1
7th Energy level
10,230.00 kJ/mol  
19
114,300.00 kJ/mol  
1
8th Energy Level
11,800.00 kJ/mol  
19
125,300.00 kJ/mol  
1
9th Energy Level
15,600.00 kJ/mol  
17
134,700.00 kJ/mol  
1
10th Energy Level
17,100.00 kJ/mol  
19
144,300.00 kJ/mol  
1
11th Energy Level
31,270.00 kJ/mol  
6
26,130.00 kJ/mol  
12
12th Energy Level
5,490.00 kJ/mol  
99+
28,750.00 kJ/mol  
36
13th Energy Level
5,490.00 kJ/mol  
99+
34,230.00 kJ/mol  
10
14th Energy Level
5,490.00 kJ/mol  
99+
37,066.00 kJ/mol  
12
15th Energy Level
54,900.00 kJ/mol  
99+
97,510.00 kJ/mol  
2
16th Energy Level
54,900.00 kJ/mol  
99+
105,800.00 kJ/mol  
2
17th Energy Level
549.50 kJ/mol  
99+
114,300.00 kJ/mol  
3
18th Energy Level
5,490.00 kJ/mol  
99+
125,300.00 kJ/mol  
4
19th Energy Level
549.50 kJ/mol  
99+
134,700.00 kJ/mol  
5
20th Energy Level
549.00 kJ/mol  
99+
144,300.00 kJ/mol  
7
21st Energy Level
549.50 kJ/mol  
99+
157,700.00 kJ/mol  
7
22nd Energy Level
549.00 kJ/mol  
99+
166,090.00 kJ/mol  
6
23rd Energy Level
549.50 kJ/mol  
99+
653.80 kJ/mol  
99+
24th Energy Level
549.50 kJ/mol  
99+
653.80 kJ/mol  
32
25th Energy Level
549.00 kJ/mol  
99+
653.80 kJ/mol  
34
26th Energy Level
549.50 kJ/mol  
99+
653.80 kJ/mol  
33
27th Energy Level
549.50 kJ/mol  
99+
652.90 kJ/mol  
34
28th Energy Level
549.50 kJ/mol  
99+
653.80 kJ/mol  
39
29th Energy Level
549.50 kJ/mol  
99+
653.80 kJ/mol  
40
30th Energy Level
549.50 kJ/mol  
99+
653.80 kJ/mol  
36
Electrochemical Equivalent
1.64 g/amp-hr  
99+
0.32 g/amp-hr  
99+
Electron Work Function
2.59 eV  
99+
4.50 eV  
19
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
38  
99+
24  
99+
Electron Configuration
[Kr] 5s2  
[Ar] 3d5 4s1  
Crystal Structure
Face Centered Cubic (FCC)  
Body Centered Cubic (BCC)  
Crystal Lattice
FCC-Crystal-Structure-of-Strontium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
38  
99+
24  
99+
Number of Neutrons
50  
99+
28  
99+
Number of Electrons
38  
99+
24  
99+
Radius of an Atom
  
  
Atomic Radius
215.00 pm  
6
128.00 pm  
99+
Covalent Radius
195.00 pm  
15
139.00 pm  
99+
Van der Waals Radius
249.00 pm  
11
200.00 pm  
35
Atomic Weight
87.62 amu  
99+
52.00 amu  
99+
Atomic Volume
33.70 cm3/mol  
9
7.23 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Rubidium
  
Vanadium
  
Next Element
Yttrium
  
Manganese
  
Valence Electron Potential
25.70 (-eV)  
99+
170.00 (-eV)  
4
Lattice Constant
608.49 pm  
6
291.00 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.57  
40
1.86  
4
Mechanical
Density
  
  
Density At Room Temperature
2.64 g/cm3  
99+
7.19 g/cm3  
99+
Density When Liquid (at m.p.)
2.38 g/cm3  
99+
6.30 g/cm3  
99+
Tensile Strength
170.00 MPa  
21
689.00 MPa  
7
Viscosity
0.00  
2
0.00  
23
Vapor Pressure
  
  
Vapor Pressure at 1000 K
121.00 (Pa)  
1
0.00 (Pa)  
26
Vapor Pressure at 2000 K
0.00 (Pa)  
38
774.00 (Pa)  
1
Elasticity properties
  
  
Shear Modulus
6.03 GPa  
99+
115.00 GPa  
9
Bulk Modulus
11.00 GPa  
99+
160.00 GPa  
11
Young's Modulus
15.70 GPa  
99+
279.00 GPa  
8
Poisson Ratio
0.28  
17
0.21  
33
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
2.64  
99+
7.19  
99+
Magnetic Ordering
Paramagnetic  
Antiferromagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
17
Susceptibility
0.00  
35
0.00  
10
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
132.00 nΩ·m  
24
125.00 nΩ·m  
27
Electrical Conductivity
0.08 106/cm Ω  
31
0.08 106/cm Ω  
30
Electron Affinity
5.03 kJ/mol  
99+
64.30 kJ/mol  
17
Thermal
Specific Heat
0.30 J/(kg K)  
18
0.45 J/(kg K)  
12
Molar Heat Capacity
26.40 J/mol·K  
36
23.35 J/mol·K  
99+
Thermal Conductivity
35.40 W/m·K  
38
93.90 W/m·K  
17
Critical Temperature
1,050.00 K  
99+
1,907.00 K  
24
Thermal Expansion
22.50 µm/(m·K)  
19
4.90 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
150.00 kJ/mol  
99+
348.80 kJ/mol  
35
Enthalpy of Fusion
9.16 kJ/mol  
99+
15.31 kJ/mol  
20
Enthalpy of Atomization
163.20 kJ/mol  
99+
397.50 kJ/mol  
27
Standard Molar Entropy
55.00 J/mol.K  
34
23.80 J/mol.K  
99+
Summary >>
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