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Properties of Barium and Thallium

Barium
Thallium
Properties of Thallium & Barium


Physical Properties
Melting Point
725.00 °C   
99+
303.50 °C   
99+
Boiling Point
1,140.00 °C   
99+
1,457.00 °C   
99+
Hardness
  
  
Mohs Hardness
1.25   
19
1.20   
20
Brinell Hardness
Not Available   
26.50 MPa   
99+
Vickers Hardness
Not Available   
Not Available   
Optical Properties
  
  
Refractive Index
Not Available   
Not Available   
Reflectivity
Not Available   
Not Available   
Speed of Sound
1,620.00 m/s   
99+
818.00 m/s   
99+
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
Ba   
Tl   
Isotopes
  
  
Known Isotopes
37   
2
32   
7
Electronegativity
  
  
Pauling Electronegativity
0.89   
99+
1.62   
21
Sanderson Electronegativity
0.68   
28
2.25   
5
Allred Rochow Electronegativity
0.97   
38
1.44   
17
Mulliken-Jaffe Electronegativity
0.88   
22
1.96   
6
Allen Electronegativity
0.88   
99+
1.79   
13
Electropositivity
  
  
Pauling Electropositivity
3.11   
4
2.38   
33
Ionization Energies
  
  
1st Energy Level
502.90 kJ/mol   
99+
589.40 kJ/mol   
99+
2nd Energy Level
965.20 kJ/mol   
99+
1,971.00 kJ/mol   
14
3rd Energy Level
3,600.00 kJ/mol   
14
2,878.00 kJ/mol   
32
Electrochemical Equivalent
2.56 g/amp-hr   
20
7.63 g/amp-hr   
2
Electron Work Function
2.70 eV   
99+
3.84 eV   
28
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   
?
Corrosion is a process which converts refined metals to their more stable forms, for example, its oxide and hydroxide. This process of metals getting corroded is a gradual destruction of metals by chemical reactions.Corrosion, 
?
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
3.51 g/cm3   
99+
11.85 g/cm3   
31
Density When Liquid (at m.p.)
3.34 g/cm3   
99+
11.22 g/cm3   
13
Vapor Pressure
  
  
Vapor Pressure at 1000 K
7.11 (Pa)   
6
16.90 (Pa)   
5
Vapor Pressure at 2000 K
Not Available   
Not Available   
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Elasticity properties
  
  
Shear Modulus
4.90 GPa   
99+
2.80 GPa   
99+
Bulk Modulus
9.60 GPa   
99+
43.00 GPa   
28
Young's Modulus
13.00 GPa   
99+
8.00 GPa   
99+
Poisson Ratio
Not Available   
0.45   
2
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, 
?
Sectility is the ability to be cut into pieces. Metals and paper are sectile.Sectile   
Periodic Table
Symbol
Ba   
Tl   
Group Number
2   
16
13   
5
Period Number
6   
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 p-block is on the right side of the periodic table and includes elements from the six columns beginning with column 13 and ending with column 18. Helium, though being in the top of group 18, is not included in the p-block.p 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   
?
All post transition metals are placed in group number 13, 14 and 15 of periodic table. In fact, they are located between Transition Metals and Metalloids. Post transition metals have very poor mechanical properties.Post-​Transition   
Atomic Properties
Atomic Number
56   
99+
81   
35
Atomic Weight
137.33 amu   
99+
204.38 amu   
31
Atomic Volume
39.24 cm3/mol   
5
17.20 cm3/mol   
31
Electron Configuration
[Xe] 6s2   
[Xe] 4f14 5d10 6s2 6p1   
Valence Electron Potential
21.30 (-eV)   
99+
9.60 (-eV)   
99+
Atom
  
  
Number of Protons
56   
99+
81   
35
Number of Neutrons
81   
99+
123   
20
Number of Electrons
56   
99+
81   
35
Crystal Structure
?
BCC is a basis type of cubic crystal structure. In crystallography, the cubic crystals structure is a crystal system where the unit cell has a cube shaped structure. This is one of the simplest crystal structure found in crystals of metal.Body Centered Cubic (BCC)   
?
The hexagonal crystal system consists of the 7 point groups such that all their space groups have the hexagonal lattice as underlying lattice. The hexagonal crystal family consists of the 12 point groups such that at least one of their space groups has theHexagonal Close Packed (HCP)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Radius of an Atom
  
  
Atomic Radius
222.00 pm   
4
170.00 pm   
22
Covalent Radius
215.00 pm   
5
145.00 pm   
39
Van der Waals Radius
268.00 pm   
6
196.00 pm   
30
Lattice Constant
502.80 pm   
15
345.66 pm   
99+
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.60   
6
Adjacent Atomic Numbers
  
  
Next Element
Lanthanum
  
Lead
  
Previous Element
Cesium
  
Mercury
  
Magnetic Properties
Electrical Properties
  
  
Resistivity
332.00 nΩ·m   
13
0.18 nΩ·m   
99+
Electrical Conductivity
0.03 106/cm Ω   
40
0.06 106/cm Ω   
32
Electron Affinity
13.95 kJ/mol   
36
19.20 kJ/mol   
32
Electrical Property
?
Under certain conditions, superconductor metals offer zero resistance to electric current it means this type of metals will conduct electricity without any resistance.Superconductor   
?
Conductor metals have very low resistance to electric currents. They can easily conduct electric current through them.Conductor   
Magnetic Characteristics
  
  
Specific Gravity
3.62   
99+
11.85   
22
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   
?
Diamagnetic metals produce a magnetic field opposite to the applied magnetic field. Thus, they are repelled by magnets and show magnetic nature.Diamagnetic   
Permeability
Not Available   
Not Available   
Susceptibility
Not Available   
Not Available   
Thermal Properties
Specific Heat
0.20 J/(kg K)   
30
0.13 J/(kg K)   
39
Thermal Conductivity
18.40 W/m·K   
99+
46.10 W/m·K   
33
Critical Temperature
Not Available   
Not Available   
Molar Heat Capacity
28.07 J/mol·K   
12
26.32 J/mol·K   
29
Thermal Expansion
20.60 µm/(m·K)   
22
29.90 µm/(m·K)   
12
Standard Molar Entropy
62.50 J/mol.K   
20
64.20 J/mol.K   
19
Enthalpy
  
  
Enthalpy of Vaporization
140.00 kJ/mol   
99+
162.10 kJ/mol   
99+
Enthalpy of Fusion
7.66 kJ/mol   
99+
4.27 kJ/mol   
99+
Enthalpy of Atomization
175.70 kJ/mol   
99+
179.90 kJ/mol   
99+
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