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What is Strontium?
Strontium


Periodic Table
Symbol
Sr
Group Number
2 16
Period Number
5 3
Block
s block
Element Family
Alkaline Earth
CAS Number
7440246 56
Space Group Name
Fm_ 3m
Space Group Number
225.00 3
Facts
Interesting Facts
  • Strontium element is softer than Calcium.
  • Silvery Strontium turns yellow, if exposed to air.
Sources
Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
William Cruickshank
Discovery
In 1787
Abundance
Abundance In Universe
0.00 % 15
Abundance In Sun
0.00 % 15
Abundance In Meteorites
0.00 % 15
Abundance In Earth's Crust
0.04 % 10
Abundance In Oceans
0.00 % 4
Abundance In Humans
0.00 % 8
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.
Industrial Uses
Ammunition Industry, Chemical Industry
Medical Uses
-
Other Uses
Alloys
Biological Properties
Toxicity
Non Toxic
Present in Human Body
Yes
In Blood
0.03 Blood/mg dm-3 19
In Bone
140.00 p.p.m. 7
Physical
Melting Point
769.00 °C 57
Boiling Point
1,384.00 °C 63
Appearance
Physical State
Solid
Color
Silvery White
Luster
Metallic
Hardness
Mohs Hardness
1.50 19
Brinell Hardness
110.00 MPa 60
Vickers Hardness
15.00 MPa 68
Speed of Sound
4,170.00 m/s 23
Optical Properties
Refractive Index
1.43 39
Reflectivity
65.00 % 18
Allotropes
No
α Allotropes
-
β Allotropes
-
γ Allotropes
-
Chemical
Chemical Formula
Sr
Isotopes
Known Isotopes
27 12
Electronegativity
Pauling Electronegativity
0.95 48
Sanderson Electronegativity
0.72 46
Allred Rochow Electronegativity
0.99 38
Mulliken-Jaffe Electronegativity
1.00 46
Allen Electronegativity
0.96 57
Electropositivity
Pauling Electropositivity
3.05 7
Ionization Energies
1st Energy Level
549.50 kJ/mol 70
2nd Energy Level
1,064.20 kJ/mol 78
3rd Energy Level
4,138.00 kJ/mol 10
4th Energy Level
5,500.00 kJ/mol 22
5th Energy Level
6,910.00 kJ/mol 30
6th Energy Level
8,760.00 kJ/mol 26
7th Energy level
10,230.00 kJ/mol 19
8th Energy Level
11,800.00 kJ/mol 19
9th Energy Level
15,600.00 kJ/mol 17
10th Energy Level
17,100.00 kJ/mol 19
11th Energy Level
31,270.00 kJ/mol 6
12th Energy Level
5,490.00 kJ/mol 71
13th Energy Level
5,490.00 kJ/mol 60
14th Energy Level
5,490.00 kJ/mol 47
15th Energy Level
54,900.00 kJ/mol 60
16th Energy Level
54,900.00 kJ/mol 48
17th Energy Level
549.50 kJ/mol 74
18th Energy Level
5,490.00 kJ/mol 62
19th Energy Level
549.50 kJ/mol 72
20th Energy Level
549.00 kJ/mol 66
21st Energy Level
549.50 kJ/mol 76
22nd Energy Level
549.00 kJ/mol 61
23rd Energy Level
549.50 kJ/mol 75
24th Energy Level
549.50 kJ/mol 65
25th Energy Level
549.00 kJ/mol 63
26th Energy Level
549.50 kJ/mol 71
27th Energy Level
549.50 kJ/mol 67
28th Energy Level
549.50 kJ/mol 71
29th Energy Level
549.50 kJ/mol 73
30th Energy Level
549.50 kJ/mol 67
Electrochemical Equivalent
1.64 g/amp-hr 49
Electron Work Function
2.59 eV 53
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic
Atomic Number
38 74
Electron Configuration
[Kr] 5s2
Crystal Structure
Face Centered Cubic (FCC)
Crystal Lattice
FCC-Crystal-Structure-of-Strontium.jpg#100
Atom
Number of Protons
38 73
Number of Neutrons
50 56
Number of Electrons
38 73
Radius of an Atom
Atomic Radius
215.00 pm 6
Covalent Radius
195.00 pm 15
Van der Waals Radius
249.00 pm 11
Atomic Weight
87.62 amu 68
Atomic Volume
33.70 cm3/mol 9
Adjacent Atomic Numbers
Previous Element
45
Next Element
59
Valence Electron Potential
25.70 (-eV) 59
Lattice Constant
608.49 pm 6
Lattice Angles
π/2, π/2, π/2
Lattice C/A Ratio
1.57 40
Mechanical
Density
Density At Room Temperature
2.64 g/cm3 80
Density When Liquid (at m.p.)
2.38 g/cm3 81
Tensile Strength
170.00 MPa 21
Viscosity
0.00 2
Vapor Pressure
Vapor Pressure at 1000 K
121.00 (Pa) 1
Vapor Pressure at 2000 K
0.00 (Pa) 38
Elasticity properties
Shear Modulus
6.03 GPa 58
Bulk Modulus
11.00 GPa 58
Young's Modulus
15.70 GPa 54
Poisson Ratio
0.28 17
Other Mechanical Properties
-
Magnetic
Magnetic Characteristics
Specific Gravity
2.64 79
Magnetic Ordering
Paramagnetic
Permeability
0.00 H/m 17
Susceptibility
0.00 35
Electrical Properties
Electrical Property
-
Resistivity
132.00 nΩ·m 24
Electrical Conductivity
0.08 106/cm Ω 31
Electron Affinity
5.03 kJ/mol 44
Thermal
Specific Heat
0.30 J/(kg K) 18
Molar Heat Capacity
26.40 J/mol·K 36
Thermal Conductivity
35.40 W/m·K 38
Critical Temperature
1,050.00 K 59
Thermal Expansion
22.50 µm/(m·K) 19
Enthalpy
Enthalpy of Vaporization
150.00 kJ/mol 69
Enthalpy of Fusion
9.16 kJ/mol 44
Enthalpy of Atomization
163.20 kJ/mol 62
Standard Molar Entropy
55.00 J/mol.K 34
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