Symbol
Sr
  
Al
  
Period Number
5
  
3
  
Block
s block
  
p block
  
Element Family
Alkaline Earth
  
Post-Transition
  
Space Group Name
Fm_ 3m
  
Fm_ 3m
  
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 Sun
~0.000005 %
  
15
Abundance In Earth's Crust
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
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
  
  
Brinell Hardness
Not Available
  
160.00 MPa
  
99+
Vickers Hardness
Not Available
  
Speed of Sound
Not Available
  
5,000.00 m/s
  
10
Optical Properties
  
  
Reflectivity
Not Available
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Sr
  
Al
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Electropositivity
  
  
Pauling Electropositivity
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+
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
  
Chemical Stability, Ionization, Radioactive Isotopes
  
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
  
  
Radius of an Atom
  
  
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 Angles
π/2, π/2, π/2
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Not Available
  
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
  
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Elasticity properties
  
  
Bulk Modulus
Not Available
  
Other Mechanical Properties
NA
  
Ductile, Malleable
  
Magnetic Characteristics
  
  
Magnetic Ordering
Paramagnetic
  
Paramagnetic
  
Permeability
Not Available
  
Susceptibility
Not Available
  
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
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+