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Properties of Tantalum and Curium

Tantalum
Curium
Properties of Curium & Tantalum


Physical Properties
Melting Point
2,996.00 °C   
4
1,340.00 °C   
34
Boiling Point
5,425.00 °C   
4
3,110.00 °C   
30
Hardness
  
  
Mohs Hardness
6.50   
5
Not Available   
Brinell Hardness
440.00 MPa   
28
Not Available   
Vickers Hardness
870.00 MPa   
12
Not Available   
Optical Properties
  
  
Refractive Index
Not Available   
Not Available   
Reflectivity
78.00 %   
6
Not Available   
Speed of Sound
3,400.00 m/s   
22
Not Available   
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
Ta   
Cm   
Isotopes
  
  
Known Isotopes
31   
8
15   
24
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
1.30   
32
Sanderson Electronegativity
Not Available   
Not Available   
Allred Rochow Electronegativity
1.33   
22
1.20   
27
Mulliken-Jaffe Electronegativity
Not Available   
Not Available   
Allen Electronegativity
1.34   
33
Not Available   
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
2.70   
22
Ionization Energies
  
  
1st Energy Level
761.00 kJ/mol   
18
581.00 kJ/mol   
99+
2nd Energy Level
1,500.00 kJ/mol   
40
1,196.00 kJ/mol   
99+
3rd Energy Level
Not Available   
2,026.00 kJ/mol   
99+
Electrochemical Equivalent
1.35 g/amp-hr   
99+
3.07 g/amp-hr   
16
Electron Work Function
4.25 eV   
21
Not Available   
Other Chemical Properties
?
Anti-corrosion metals have the protection on their surfaces which protect them from corroding in corrosive environments.Anti 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, 
?
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   
Mechanical Properties
Density
  
  
Density At Room Temperature
16.69 g/cm3   
18
13.51 g/cm3   
25
Density When Liquid (at m.p.)
15.00 g/cm3   
9
13.85 g/cm3   
10
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
Not Available   
Vapor Pressure at 2000 K
0.00 (Pa)   
31
Not Available   
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Elasticity properties
  
  
Shear Modulus
69.00 GPa   
13
Not Available   
Bulk Modulus
200.00 GPa   
8
Not Available   
Young's Modulus
186.00 GPa   
13
Not Available   
Poisson Ratio
0.34   
10
Not Available   
Other Mechanical Properties
?
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   
Unknown   
Periodic Table
Symbol
Ta   
Cm   
Group Number
5   
13
Not Available   
Period Number
6   
7   
Block
?
The d-block is on the middle of the periodic table and includes elements from columns 3 through 12. These elements are also known as the transition metals because they show a transitivity in their properties i.e. they show a trend in their properties.d 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
?
What is Transition Metal? All transition metals are placed under the d-block from group number 3 to 12. Transition metals show characteristics like malleability, ductility and are good conductor of electricity.Transition Metal   
?
Total 15 metals are included in actinide series, from Actinium to Lawrencium. Actinide series is located under f and d block of the periodic table.Actinide   
Atomic Properties
Atomic Number
73   
99+
96   
22
Atomic Weight
180.95 amu   
38
247.00 amu   
18
Atomic Volume
10.90 cm3/mol   
99+
18.28 cm3/mol   
26
Electron Configuration
[Xe] 4f14 5d3 6s2   
[Rn] 5f7 6d1 7s2   
Valence Electron Potential
110.00 (-eV)   
7
44.50 (-eV)   
38
Atom
  
  
Number of Protons
73   
99+
96   
22
Number of Neutrons
108   
28
151   
10
Number of Electrons
73   
99+
96   
22
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)   
?
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
BCC-Crystal-Structure-.jpg#100   
DHCP-Crystal-Structure-of-Curium.jpg#100   
Radius of an Atom
  
  
Atomic Radius
146.00 pm   
35
174.00 pm   
20
Covalent Radius
170.00 pm   
25
169.00 pm   
26
Van der Waals Radius
200.00 pm   
28
200.00 pm   
28
Lattice Constant
330.13 pm   
99+
Not Available   
Lattice Angles
π/2, π/2, π/2   
NA   
Lattice C/A Ratio
Not Available   
Not Available   
Adjacent Atomic Numbers
  
  
Next Element
Tungsten
  
Berkelium
  
Previous Element
Hafnium
  
Americium
  
Magnetic Properties
Electrical Properties
  
  
Resistivity
131.00 nΩ·m   
25
1.25 nΩ·m   
99+
Electrical Conductivity
0.08 106/cm Ω   
27
Not Available   
Electron Affinity
31.00 kJ/mol   
29
Not Available   
Electrical Property
?
Conductor metals have very low resistance to electric currents. They can easily conduct electric current through them.Conductor   
Unknown   
Magnetic Characteristics
  
  
Specific Gravity
16.65   
11
13.51   
17
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   
?
Antiferromagnetic metals denote or exhibit a form of magnetism characterized by an anti-parallel alignment of adjacent electron spins in a crystal lattice.Antiferromagnetic   
Permeability
Not Available   
Not Available   
Susceptibility
Not Available   
Not Available   
Thermal Properties
Specific Heat
0.14 J/(kg K)   
37
Not Available   
Thermal Conductivity
57.50 W/m·K   
27
Not Available   
Critical Temperature
Not Available   
Not Available   
Molar Heat Capacity
25.36 J/mol·K   
99+
Not Available   
Thermal Expansion
6.30 µm/(m·K)   
99+
Not Available   
Standard Molar Entropy
41.50 J/mol.K   
37
Not Available   
Enthalpy
  
  
Enthalpy of Vaporization
753.10 kJ/mol   
2
Not Available   
Enthalpy of Fusion
31.40 kJ/mol   
3
15.00 kJ/mol   
21
Enthalpy of Atomization
782.00 kJ/mol   
3
Not Available   
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