Strontium Aluminium Comparison
Periodic Table
Symbol
Sr
Al
Group Number
2
16
13
5
Period Number
5
3
Block
s block
p block
Element Family
Alkaline Earth
Post-Transition
CAS Number
7440246
99+
7429905
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.
- Aluminum’s abundance percentage is more as it is found in more than 260 minerals.
- Pure Aluminum always reacts with oxygen rapidly.
- It is a good conductor of heat and electricity and used in transmission lines.
Sources
Found in Minerals, Mining, Ores of Minerals
By Electrolysis Process, Earth's crust, Mining
History
Who Discovered
William Cruickshank
Hans Christian Oersted
Discovery
In 1787
In 1825
Abundance
Abundance In Universe
4 * 10-6 %
14
5 * 10-3 %
5
Abundance In Sun
~0.000005 %
15
~0.006 %
5
Abundance In Meteorites
0.00 %
15
0.91 %
5
Abundance In Earth's Crust
0.04 %
10
8.10 %
1
Abundance In Oceans
0.00 %
4
0.00 %
6
Abundance In Humans
0.00 %
7
0.00 %
10
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.
- Aluminum is used in a various products; for example, cans, foils, kitchen utensils, window frames, beer kegs and aero plane parts, automobile parts, etc.
Industrial Uses
Ammunition Industry, Chemical Industry
Aerospace Industry, Ammunition Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry
Medical Uses
NA
Dentistry, Pharmaceutical Industry, Surgical Instruments Manufacturing
Other Uses
Alloys
Alloys, Jewellery, Sculptures, Statues
Biological Properties
Toxicity
Non Toxic
Non Toxic
Present in Human Body
Yes
Yes
In Blood
0.03 Blood/mg dm-3
19
0.39 Blood/mg dm-3
9
In Bone
140.00 p.p.m.
7
27.00 p.p.m.
11
Physical Properties
Melting Point
769.00 °C
99+
660.37 °C
99+
Boiling Point
1,384.00 °C
99+
2,467.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silvery Gray
Luster
Metallic
Metallic
Hardness
Mohs Hardness
1.50
18
2.75
13
Brinell Hardness
Not Available
160.00 MPa
99+
Vickers Hardness
Not Available
160.00 MPa
35
Speed of Sound
Not Available
5,000.00 m/s
10
Optical Properties
Reflectivity
Not Available
71.00 %
10
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
Al
Isotopes
Known Isotopes
27
12
11
27
Electronegativity
Pauling Electronegativity
0.95
99+
1.61
22
Sanderson Electronegativity
0.72
27
1.71
13
Allred Rochow Electronegativity
0.99
37
1.47
14
Mulliken-Jaffe Electronegativity
1.00
18
1.83
8
Allen Electronegativity
0.96
40
1.61
20
Electropositivity
Pauling Electropositivity
3.05
7
2.39
32
Ionization Energies
1st Energy Level
549.50 kJ/mol
99+
577.50 kJ/mol
99+
2nd Energy Level
1,064.20 kJ/mol
99+
1,816.70 kJ/mol
19
3rd Energy Level
4,138.00 kJ/mol
10
2,744.80 kJ/mol
38
4th Energy Level
5,500.00 kJ/mol
13
11,577.00 kJ/mol
3
5th Energy Level
6,910.00 kJ/mol
18
14,842.00 kJ/mol
2
6th Energy Level
8,760.00 kJ/mol
18
18,379.00 kJ/mol
2
7th Energy level
10,230.00 kJ/mol
19
23,326.00 kJ/mol
2
8th Energy Level
11,800.00 kJ/mol
19
27,465.00 kJ/mol
2
9th Energy Level
15,600.00 kJ/mol
17
31,853.00 kJ/mol
2
10th Energy Level
17,100.00 kJ/mol
19
38,473.00 kJ/mol
4
11th Energy Level
31,270.00 kJ/mol
6
42,647.00 kJ/mol
5
Electrochemical Equivalent
1.64 g/amp-hr
99+
0.34 g/amp-hr
99+
Electron Work Function
2.59 eV
99+
4.28 eV
19
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Chemical Stability, Ionization, Radioactive Isotopes
Atomic Properties
Atomic Number
38
99+
13
99+
Electron Configuration
[Kr] 5s2
[Ne] 3s2 3p1
Crystal Structure
Face Centered Cubic (FCC)
Face Centered Cubic (FCC)
Crystal Lattice
FCC-Crystal-Structure-of-Strontium.jpg#100
FCC-Crystal-Structure-of-Aluminium.jpg#100
Atom
Number of Protons
38
99+
13
99+
Number of Neutrons
50
99+
14
99+
Number of Electrons
38
99+
13
99+
Radius of an Atom
Atomic Radius
215.00 pm
5
143.00 pm
37
Covalent Radius
195.00 pm
15
121.00 pm
99+
Van der Waals Radius
249.00 pm
7
184.00 pm
34
Atomic Weight
87.62 amu
99+
26.98 amu
99+
Atomic Volume
33.70 cm3/mol
6
10.00 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
25.70 (-eV)
99+
80.70 (-eV)
17
Lattice Constant
608.49 pm
6
404.95 pm
22
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+
2.70 g/cm3
99+
Density When Liquid (at m.p.)
2.38 g/cm3
99+
2.38 g/cm3
99+
Tensile Strength
Not Available
40.00 MPa
19
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
121.00 (Pa)
1
0.00 (Pa)
18
Elasticity properties
Shear Modulus
6.03 GPa
99+
26.00 GPa
29
Bulk Modulus
Not Available
76.00 GPa
18
Young's Modulus
15.70 GPa
99+
70.00 GPa
28
Poisson Ratio
0.28
17
0.35
9
Other Mechanical Properties
NA
Ductile, Malleable
Magnetic Properties
Magnetic Characteristics
Specific Gravity
2.64
99+
2.72
99+
Magnetic Ordering
Paramagnetic
Paramagnetic
Permeability
Not Available
0.00 H/m
4
Susceptibility
Not Available
0.00
3
Electrical Properties
Electrical Property
NA
Conductor
Resistivity
132.00 nΩ·m
24
28.20 nΩ·m
99+
Electrical Conductivity
0.08 106/cm Ω
26
0.38 106/cm Ω
4
Electron Affinity
5.03 kJ/mol
38
42.50 kJ/mol
26
Thermal Properties
Specific Heat
0.30 J/(kg K)
18
0.90 J/(kg K)
5
Molar Heat Capacity
26.40 J/mol·K
28
24.20 J/mol·K
99+
Thermal Conductivity
35.40 W/m·K
37
237.00 W/m·K
4
Critical Temperature
Not Available
Not Available
Thermal Expansion
22.50 µm/(m·K)
18
23.10 µm/(m·K)
17
Enthalpy
Enthalpy of Vaporization
150.00 kJ/mol
99+
293.70 kJ/mol
31
Enthalpy of Fusion
9.16 kJ/mol
38
10.67 kJ/mol
35
Enthalpy of Atomization
163.20 kJ/mol
99+
322.20 kJ/mol
31
Standard Molar Entropy
55.00 J/mol.K
26
28.30 J/mol.K
99+
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