Symbol
Zr
  
Sr
  
Period Number
5
  
5
  
Block
d block
  
s block
  
Element Family
Transition Metal
  
Alkaline Earth
  
Space Group Name
P63/mmc
  
Fm_ 3m
  
Interesting Facts
- Zirconium metal can resist to weak acids.
- Zirconium metal reacts with oxygen and nitrogen in the atmosphere.
  
- Strontium element is softer than Calcium.
- Silvery Strontium turns yellow, if exposed to air.
  
Sources
Found in Minerals, Mining, Ores of Minerals
  
Found in Minerals, Mining, Ores of Minerals
  
History
  
  
Who Discovered
Martin Heinrich Klaproth
  
William Cruickshank
  
Discovery
In 1789
  
In 1787
  
Abundance
  
  
Abundance In Sun
~0.000004 %
  
16
~0.000005 %
  
15
Abundance In Earth's Crust
Uses & Benefits
- As this metal does not absorb neutrons; It is used in nuclear power stations.
- Its oxide is used in ultra strong ceramics. It is also used in manufacturing Crucibles.
  
- 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
Aerospace Industry, Ammunition Industry
  
Ammunition Industry, Chemical Industry
  
Medical Uses
NA
  
NA
  
Other Uses
Alloys, Nuclear Research, Research Purposes
  
Alloys
  
Biological Properties
  
  
Toxicity
NA
  
Non Toxic
  
Present in Human Body
Yes
  
Yes
  
In Blood
0.01 Blood/mg dm-3
  
21
0.03 Blood/mg dm-3
  
19
In Bone
0.10 p.p.m.
  
23
140.00 p.p.m.
  
7
Melting Point
1,852.00 °C
  
15
Boiling Point
4,377.00 °C
  
11
1,384.00 °C
  
99+
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silvery White
  
Silvery White
  
Luster
Lustrous
  
Metallic
  
Hardness
  
  
Brinell Hardness
Not Available
  
Vickers Hardness
Not Available
  
Speed of Sound
3,800.00 m/s
  
20
Not Available
  
Optical Properties
  
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Zr
  
Sr
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
640.10 kJ/mol
  
99+
549.50 kJ/mol
  
99+
2nd Energy Level
1,270.00 kJ/mol
  
99+
1,064.20 kJ/mol
  
99+
3rd Energy Level
2,218.00 kJ/mol
  
99+
4,138.00 kJ/mol
  
10
4th Energy Level
3,313.00 kJ/mol
  
99+
5,500.00 kJ/mol
  
13
5th Energy Level
7,752.00 kJ/mol
  
10
6,910.00 kJ/mol
  
18
6th Energy Level
9,500.00 kJ/mol
  
15
8,760.00 kJ/mol
  
18
7th Energy level
Not Available
  
10,230.00 kJ/mol
  
19
8th Energy Level
Not Available
  
11,800.00 kJ/mol
  
19
9th Energy Level
Not Available
  
15,600.00 kJ/mol
  
17
10th Energy Level
Not Available
  
17,100.00 kJ/mol
  
19
11th Energy Level
Not Available
  
31,270.00 kJ/mol
  
6
Electrochemical Equivalent
0.85 g/amp-hr
  
99+
1.64 g/amp-hr
  
99+
Other Chemical Properties
Anti Corrosion, Flammable, Ionization, Radioactive Isotopes, Solubility
  
Ionization, Radioactive Isotopes, Radioactivity, Solubility
  
Electron Configuration
[Kr] 4d2 5s2
  
[Kr] 5s2
  
Crystal Structure
Hexagonal Close Packed (HCP)
  
Face Centered Cubic (FCC)
  
Crystal Lattice
HCP-Crystal-Structure-of-Zirconium.jpg#100
  
FCC-Crystal-Structure-of-Strontium.jpg#100
  
Atom
  
  
Radius of an Atom
  
  
Atomic Volume
14.10 cm3/mol
  
36
33.70 cm3/mol
  
6
Adjacent Atomic Numbers
  
  
Valence Electron Potential
80.00 (-eV)
  
18
25.70 (-eV)
  
99+
Lattice Angles
π/2, π/2, 2 π/3
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Density
  
  
Density At Room Temperature
6.52 g/cm3
  
99+
2.64 g/cm3
  
99+
Density When Liquid (at m.p.)
5.80 g/cm3
  
99+
2.38 g/cm3
  
99+
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Elasticity properties
  
  
Bulk Modulus
Not Available
  
Other Mechanical Properties
Ductile, Malleable
  
NA
  
Magnetic Characteristics
  
  
Magnetic Ordering
Paramagnetic
  
Paramagnetic
  
Electrical Properties
  
  
Electrical Property
Conductor
  
NA
  
Resistivity
421.00 nΩ·m
  
11
132.00 nΩ·m
  
24
Electrical Conductivity
0.02 106/cm Ω
  
99+
0.08 106/cm Ω
  
26
Electron Affinity
41.10 kJ/mol
  
27
5.03 kJ/mol
  
38
Specific Heat
0.27 J/(kg K)
  
19
0.30 J/(kg K)
  
18
Molar Heat Capacity
25.36 J/mol·K
  
99+
26.40 J/mol·K
  
28
Thermal Conductivity
22.60 W/m·K
  
99+
35.40 W/m·K
  
37
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
5.70 µm/(m·K)
  
99+
22.50 µm/(m·K)
  
18
Enthalpy
  
  
Enthalpy of Vaporization
581.60 kJ/mol
  
9
150.00 kJ/mol
  
99+
Enthalpy of Fusion
20.90 kJ/mol
  
11
9.16 kJ/mol
  
38
Enthalpy of Atomization
598.00 kJ/mol
  
10
163.20 kJ/mol
  
99+
Standard Molar Entropy
39.00 J/mol.K
  
39
55.00 J/mol.K
  
26