Strontium vs Platinum
Periodic Table
Symbol
Sr
Pt
Group Number
2
16
10
8
Period Number
5
6
Block
s block
d block
Element Family
Alkaline Earth
Transition Metal
CAS Number
7440246
99+
7440064
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.
- Platinum is the rarest metal from the Precious metal categories..
- Commercially Platinum is produced as a byproduct in ores of nickel.
Sources
Found in Minerals, Mining, Ores of Minerals
Mining, Ores of metals, Ores of Minerals
History
Who Discovered
William Cruickshank
Antonio de Ulloa
Discovery
In 1787
In 1735
Abundance
Abundance In Universe
4 * 10-6 %
14
5 * 10-7 %
19
Abundance In Sun
~0.000005 %
15
~0.0000009 %
19
Abundance In Meteorites
0.00 %
15
0.00 %
25
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.
- Platinum metal is mainly used in jewellery.
- Platinum is used as an industrial catalyst in production of nitric acid, silicone and benzene.
Industrial Uses
Ammunition Industry, Chemical Industry
Aerospace Industry, Chemical Industry
Medical Uses
NA
Dentistry, Pharmaceutical Industry, Surgical Instruments Manufacturing
Other Uses
Alloys
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues
Biological Properties
Toxicity
Non Toxic
Non Toxic
Present in Human Body
Yes
No
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+
1,772.00 °C
16
Boiling Point
1,384.00 °C
99+
3,827.00 °C
15
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silvery White
Luster
Metallic
Metallic
Hardness
Mohs Hardness
1.50
18
3.50
11
Brinell Hardness
Not Available
300.00 MPa
34
Vickers Hardness
Not Available
400.00 MPa
25
Speed of Sound
Not Available
2,800.00 m/s
29
Optical Properties
Reflectivity
Not Available
73.00 %
8
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
Pt
Isotopes
Known Isotopes
27
12
35
4
Electronegativity
Pauling Electronegativity
0.95
99+
2.28
3
Sanderson Electronegativity
0.72
27
Not Available
Allred Rochow Electronegativity
0.99
37
1.44
17
Mulliken-Jaffe Electronegativity
1.00
18
Not Available
Allen Electronegativity
0.96
40
1.72
16
Electropositivity
Pauling Electropositivity
3.05
7
1.72
99+
Ionization Energies
1st Energy Level
549.50 kJ/mol
99+
870.00 kJ/mol
10
2nd Energy Level
1,064.20 kJ/mol
99+
1,791.00 kJ/mol
21
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+
1.82 g/amp-hr
35
Electron Work Function
2.59 eV
99+
5.65 eV
1
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Chemical Stability, Anti Corrosion, Ionization
Atomic Properties
Atomic Number
38
99+
78
38
Electron Configuration
[Kr] 5s2
[Xe] 4f14 5d9 6s1
Crystal Structure
Face Centered Cubic (FCC)
Face Centered Cubic (FCC)
Crystal Lattice
FCC-Crystal-Structure-of-Strontium.jpg#100
FCC-Crystal-Structure-of-Platinum.jpg#100
Atom
Number of Protons
38
99+
78
38
Number of Neutrons
50
99+
117
24
Number of Electrons
38
99+
78
38
Radius of an Atom
Atomic Radius
215.00 pm
5
139.00 pm
39
Covalent Radius
195.00 pm
15
136.00 pm
99+
Van der Waals Radius
249.00 pm
7
175.00 pm
36
Atomic Weight
87.62 amu
99+
47.87 amu
99+
Atomic Volume
33.70 cm3/mol
6
9.09 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
25.70 (-eV)
99+
392.42 (-eV)
1
Lattice Constant
608.49 pm
6
392.42 pm
24
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+
21.45 g/cm3
11
Density When Liquid (at m.p.)
2.38 g/cm3
99+
19.77 g/cm3
2
Tensile Strength
Not Available
125.00 MPa
14
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
0.07 (Pa)
18
Elasticity properties
Shear Modulus
6.03 GPa
99+
61.00 GPa
14
Bulk Modulus
Not Available
230.00 GPa
6
Young's Modulus
15.70 GPa
99+
168.00 GPa
14
Poisson Ratio
0.28
17
0.38
6
Other Mechanical Properties
NA
Ductile, Malleable
Magnetic Properties
Magnetic Characteristics
Specific Gravity
2.64
99+
21.45
4
Magnetic Ordering
Paramagnetic
Paramagnetic
Permeability
Not Available
0.00 H/m
3
Electrical Properties
Electrical Property
NA
Conductor
Resistivity
132.00 nΩ·m
24
105.00 nΩ·m
30
Electrical Conductivity
0.08 106/cm Ω
26
0.10 106/cm Ω
21
Electron Affinity
5.03 kJ/mol
38
205.30 kJ/mol
2
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
25.86 J/mol·K
35
Thermal Conductivity
35.40 W/m·K
37
71.60 W/m·K
24
Critical Temperature
Not Available
Not Available
Thermal Expansion
22.50 µm/(m·K)
18
8.80 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
150.00 kJ/mol
99+
510.50 kJ/mol
11
Enthalpy of Fusion
9.16 kJ/mol
38
19.70 kJ/mol
12
Enthalpy of Atomization
163.20 kJ/mol
99+
565.00 kJ/mol
11
Standard Molar Entropy
55.00 J/mol.K
26
41.60 J/mol.K
36
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