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Properties of Strontium and Lanthanum

Strontium
Lanthanum
Properties of Lanthanum & Strontium


Physical Properties
Melting Point
769.00 °C   
99+
920.00 °C   
99+
Boiling Point
1,384.00 °C   
99+
3,469.00 °C   
18
Hardness
  
  
Mohs Hardness
1.50   
18
2.50   
14
Brinell Hardness
Not Available   
350.00 MPa   
30
Vickers Hardness
Not Available   
360.00 MPa   
26
Optical Properties
  
  
Refractive Index
Not Available   
Not Available   
Reflectivity
Not Available   
Not Available   
Speed of Sound
Not Available   
2,475.00 m/s   
37
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   
La   
Isotopes
  
  
Known Isotopes
27   
12
31   
8
Electronegativity
  
  
Pauling Electronegativity
0.95   
99+
1.10   
99+
Sanderson Electronegativity
0.72   
27
Not Available   
Allred Rochow Electronegativity
0.99   
37
1.08   
31
Mulliken-Jaffe Electronegativity
1.00   
18
Not Available   
Allen Electronegativity
0.96   
40
Not Available   
Electropositivity
  
  
Pauling Electropositivity
3.05   
7
2.90   
10
Ionization Energies
  
  
1st Energy Level
549.50 kJ/mol   
99+
538.10 kJ/mol   
99+
2nd Energy Level
1,064.20 kJ/mol   
99+
1,067.00 kJ/mol   
99+
3rd Energy Level
4,138.00 kJ/mol   
10
1,850.30 kJ/mol   
99+
Electrochemical Equivalent
1.64 g/amp-hr   
99+
1.73 g/amp-hr   
99+
Electron Work Function
2.59 eV   
99+
3.50 eV   
31
Other Chemical Properties
?
Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.Ionization, 
?
Radioactive metals emit particles and radiation from their nuclei. This process comes in the picture because their nuclei experience the intense conflict between two strong forces. This metal also have radioactive isotopes.Radioactive Isotopes, 
?
Radioactive metals emit particles and radiation from their nuclei. This process comes in the picture because their nuclei experience the intense conflict between two strong forces.Radioactivity, 
?
Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent.Solubility   
?
Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.Ionization, 
?
Radioactive metals emit particles and radiation from their nuclei. This process comes in the picture because their nuclei experience the intense conflict between two strong forces. This metal also have radioactive isotopes.Radioactive Isotopes, 
?
Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent.Solubility   
Mechanical Properties
Density
  
  
Density At Room Temperature
2.64 g/cm3   
99+
6.16 g/cm3   
99+
Density When Liquid (at m.p.)
2.38 g/cm3   
99+
5.94 g/cm3   
99+
Vapor Pressure
  
  
Vapor Pressure at 1000 K
121.00 (Pa)   
1
Not Available   
Vapor Pressure at 2000 K
Not Available   
0.98 (Pa)   
15
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Elasticity properties
  
  
Shear Modulus
6.03 GPa   
99+
14.30 GPa   
40
Bulk Modulus
Not Available   
27.90 GPa   
99+
Young's Modulus
15.70 GPa   
99+
36.60 GPa   
99+
Poisson Ratio
0.28   
17
0.28   
17
Other Mechanical Properties
NA   
?
Ductility of metals defines their ability to deform under tensile stress; this is often characterized by the metals ability to be stretched into a wire.Ductile   
Periodic Table
Symbol
Sr   
La   
Group Number
2   
16
Not Available   
Period Number
5   
6   
Block
?
The s-block is on the left side of the periodic table that includes elements from the first two columns, the alkali metals (group 1) and alkaline earth metals (group 2), plus helium.s block   
?
The f-block is in the center-left of a 32-column periodic table but in the footnoted appendage of 18-column tables. These elements are not generally considered as part of any group. They are often called inner transition metals.f block   
Element Family
?
All alkaline earth metals are placed under group number 2 and s-block of periodic table. These metals are somewhat reactive at standard conditions. Alkaline earth metals appear shiny, silvery-white and are found in the earth’s crust.Alkaline Earth   
?
Total 15 metals are included in Lanthanide series from Lanthanum to Lutetium. Lanthanide series is located under f and d block of the periodic table.Lanthanide   
Atomic Properties
Atomic Number
38   
99+
57   
99+
Atomic Weight
87.62 amu   
99+
138.91 amu   
99+
Atomic Volume
33.70 cm3/mol   
6
20.73 cm3/mol   
16
Electron Configuration
[Kr] 5s2   
[Xe] 5d2 6s2   
Valence Electron Potential
25.70 (-eV)   
99+
40.71 (-eV)   
99+
Atom
  
  
Number of Protons
38   
99+
57   
99+
Number of Neutrons
50   
99+
82   
99+
Number of Electrons
38   
99+
57   
99+
Crystal Structure
?
In crystallography, the cubic (or isometric) crystal system is a crystal system where the unit cell is in the shape of a cube. This is one of the most common and simplest shapes found in crystals and minerals.Face Centered Cubic (FCC)   
?
In crystallography, the hexagonal crystal structure and its double hexagonal crystal structure is one of the 7 crystal structure, The hexagonal lattice system consists of just one Bravais lattice type: the hexagonal shape.Double Hexagonal Close Packed (DHCP)   
Crystal Lattice
FCC-Crystal-Structure-of-Strontium.jpg#100   
DHCP-Crystal-Structure-of-Lanthanum.jpg#100   
Radius of an Atom
  
  
Atomic Radius
215.00 pm   
5
187.00 pm   
8
Covalent Radius
195.00 pm   
15
207.00 pm   
6
Van der Waals Radius
249.00 pm   
7
240.00 pm   
13
Lattice Constant
608.49 pm   
6
377.20 pm   
28
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.62   
2
Adjacent Atomic Numbers
  
  
Next Element
Yttrium
  
Cerium
  
Previous Element
Rubidium
  
Barium
  
Magnetic Properties
Electrical Properties
  
  
Resistivity
132.00 nΩ·m   
24
615.00 nΩ·m   
7
Electrical Conductivity
0.08 106/cm Ω   
26
0.01 106/cm Ω   
99+
Electron Affinity
5.03 kJ/mol   
38
48.00 kJ/mol   
23
Electrical Property
NA   
?
Conductor metals have very low resistance to electric currents. They can easily conduct electric current through them.Conductor   
Magnetic Characteristics
  
  
Specific Gravity
2.64   
99+
6.17   
99+
Magnetic Ordering
?
Paramagnetic metals are slightly attracted by magnet, but they can’t retain the magnetic effect once they are removed from the magnetic field.Paramagnetic   
?
Paramagnetic metals are slightly attracted by magnet, but they can’t retain the magnetic effect once they are removed from the magnetic field.Paramagnetic   
Permeability
Not Available   
Not Available   
Susceptibility
Not Available   
Not Available   
Thermal Properties
Specific Heat
0.30 J/(kg K)   
18
0.19 J/(kg K)   
32
Thermal Conductivity
35.40 W/m·K   
37
13.40 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Molar Heat Capacity
26.40 J/mol·K   
28
27.11 J/mol·K   
21
Thermal Expansion
22.50 µm/(m·K)   
18
12.10 µm/(m·K)   
32
Standard Molar Entropy
55.00 J/mol.K   
26
56.90 J/mol.K   
23
Enthalpy
  
  
Enthalpy of Vaporization
150.00 kJ/mol   
99+
399.60 kJ/mol   
17
Enthalpy of Fusion
9.16 kJ/mol   
38
6.20 kJ/mol   
99+
Enthalpy of Atomization
163.20 kJ/mol   
99+
431.00 kJ/mol   
16
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