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Properties of Curium and Neptunium

Curium
Neptunium
Properties of Neptunium & Curium


Physical Properties
Melting Point
1,340.00 °C   
34
640.00 °C   
99+
Boiling Point
3,110.00 °C   
30
3,902.00 °C   
13
Hardness
  
  
Mohs Hardness
Not Available   
Not Available   
Brinell Hardness
Not Available   
Not Available   
Vickers Hardness
Not Available   
Not Available   
Optical Properties
  
  
Refractive Index
Not Available   
Not Available   
Reflectivity
Not Available   
Not Available   
Speed of Sound
Not Available   
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
Cm   
Np   
Isotopes
  
  
Known Isotopes
15   
24
20   
19
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
1.36   
29
Sanderson Electronegativity
Not Available   
Not Available   
Allred Rochow Electronegativity
1.20   
27
1.22   
26
Mulliken-Jaffe Electronegativity
Not Available   
Not Available   
Allen Electronegativity
Not Available   
Not Available   
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
2.64   
25
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol   
99+
604.50 kJ/mol   
99+
2nd Energy Level
1,196.00 kJ/mol   
99+
1,128.00 kJ/mol   
99+
3rd Energy Level
2,026.00 kJ/mol   
99+
1,997.00 kJ/mol   
99+
Electrochemical Equivalent
3.07 g/amp-hr   
16
1.77 g/amp-hr   
39
Electron Work Function
Not Available   
Not Available   
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   
?
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   
Mechanical Properties
Density
  
  
Density At Room Temperature
13.51 g/cm3   
25
19.38 g/cm3   
14
Density When Liquid (at m.p.)
13.85 g/cm3   
10
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
Not Available   
Vapor Pressure at 2000 K
Not Available   
0.11 (Pa)   
17
Tensile Strength
Not Available   
125.00 MPa   
14
Viscosity
Not Available   
Not Available   
Elasticity properties
  
  
Shear Modulus
Not Available   
Not Available   
Bulk Modulus
Not Available   
Not Available   
Young's Modulus
Not Available   
Not Available   
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
Unknown   
?
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
Cm   
Np   
Group Number
Not Available   
Not Available   
Period Number
7   
7   
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   
?
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
?
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   
?
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
96   
22
93   
25
Atomic Weight
247.00 amu   
18
237.00 amu   
22
Atomic Volume
18.28 cm3/mol   
26
11.62 cm3/mol   
99+
Electron Configuration
[Rn] 5f7 6d1 7s2   
[Rn] 5f4 6d1 7s2   
Valence Electron Potential
44.50 (-eV)   
38
96.00 (-eV)   
9
Atom
  
  
Number of Protons
96   
22
93   
25
Number of Neutrons
151   
10
144   
14
Number of Electrons
96   
22
93   
25
Crystal Structure
?
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)   
?
Orthorhombic lattices occur due to stretching a cubic lattice along two of its orthogonal sides. It gets result in a rectangular prism with a rectangular at base. These 3 bases intersect each other at 90°.Orthorhombic (ORTH)   
Crystal Lattice
DHCP-Crystal-Structure-of-Curium.jpg#100   
ORTH-Crystal-Structure-of-Neptunium.jpg#100   
Radius of an Atom
  
  
Atomic Radius
174.00 pm   
20
155.00 pm   
30
Covalent Radius
169.00 pm   
26
190.00 pm   
18
Van der Waals Radius
200.00 pm   
28
221.00 pm   
22
Lattice Constant
Not Available   
666.30 pm   
3
Lattice Angles
NA   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Adjacent Atomic Numbers
  
  
Next Element
Berkelium
  
Plutonium
  
Previous Element
Americium
  
Uranium
  
Magnetic Properties
Electrical Properties
  
  
Resistivity
1.25 nΩ·m   
99+
1.22 nΩ·m   
99+
Electrical Conductivity
Not Available   
0.01 106/cm Ω   
99+
Electron Affinity
Not Available   
Not Available   
Electrical Property
Unknown   
?
Conductor metals have very low resistance to electric currents. They can easily conduct electric current through them.Conductor   
Magnetic Characteristics
  
  
Specific Gravity
13.51   
17
20.25   
6
Magnetic Ordering
?
Antiferromagnetic metals denote or exhibit a form of magnetism characterized by an anti-parallel alignment of adjacent electron spins in a crystal lattice.Antiferromagnetic   
?
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
Not Available   
0.12 J/(kg K)   
40
Thermal Conductivity
Not Available   
6.30 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Molar Heat Capacity
Not Available   
29.46 J/mol·K   
8
Thermal Expansion
Not Available   
Not Available   
Standard Molar Entropy
Not Available   
Not Available   
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
Not Available   
Enthalpy of Fusion
15.00 kJ/mol   
21
3.20 kJ/mol   
99+
Enthalpy of Atomization
Not Available   
Not Available   
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