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Properties of Neptunium and Rubidium

Neptunium
Rubidium
Properties of Rubidium & Neptunium


Physical Properties
Melting Point
640.00 °C   
99+
38.89 °C   
99+
Boiling Point
3,902.00 °C   
13
688.00 °C   
99+
Hardness
  
  
Mohs Hardness
Not Available   
0.30   
24
Brinell Hardness
Not Available   
0.22 MPa   
99+
Vickers Hardness
Not Available   
Not Available   
Optical Properties
  
  
Refractive Index
Not Available   
Not Available   
Reflectivity
Not Available   
Not Available   
Speed of Sound
Not Available   
1,300.00 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
Np   
Rb   
Isotopes
  
  
Known Isotopes
20   
19
29   
10
Electronegativity
  
  
Pauling Electronegativity
1.36   
29
0.82   
99+
Sanderson Electronegativity
Not Available   
0.31   
32
Allred Rochow Electronegativity
1.22   
26
0.89   
40
Mulliken-Jaffe Electronegativity
Not Available   
0.69   
24
Allen Electronegativity
Not Available   
0.71   
99+
Electropositivity
  
  
Pauling Electropositivity
2.64   
25
3.18   
3
Ionization Energies
  
  
1st Energy Level
604.50 kJ/mol   
99+
403.00 kJ/mol   
99+
2nd Energy Level
1,128.00 kJ/mol   
99+
2,633.00 kJ/mol   
6
3rd Energy Level
1,997.00 kJ/mol   
99+
3,860.00 kJ/mol   
11
Electrochemical Equivalent
1.77 g/amp-hr   
39
3.19 g/amp-hr   
14
Electron Work Function
Not Available   
2.16 eV   
99+
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, 
?
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   
Mechanical Properties
Density
  
  
Density At Room Temperature
19.38 g/cm3   
14
1.53 g/cm3   
99+
Density When Liquid (at m.p.)
Not Available   
1.46 g/cm3   
99+
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
Not Available   
Vapor Pressure at 2000 K
0.11 (Pa)   
17
Not Available   
Tensile Strength
125.00 MPa   
14
Not Available   
Viscosity
Not Available   
Not Available   
Elasticity properties
  
  
Shear Modulus
Not Available   
Not Available   
Bulk Modulus
Not Available   
2.50 GPa   
99+
Young's Modulus
Not Available   
2.40 GPa   
99+
Poisson Ratio
Not Available   
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   
?
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
Np   
Rb   
Group Number
Not Available   
1   
17
Period Number
7   
5   
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 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   
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   
?
All alkali metals are placed under group number 1 and s-block of periodic table. These metals are highly reactive and are found in ores of other metals and minerals. Alkali metals can be easily distinguished from others as these metals have only 1 electronAlkali   
Atomic Properties
Atomic Number
93   
25
37   
99+
Atomic Weight
237.00 amu   
22
85.47 amu   
99+
Atomic Volume
11.62 cm3/mol   
99+
55.90 cm3/mol   
2
Electron Configuration
[Rn] 5f4 6d1 7s2   
[Kr] 5s1   
Valence Electron Potential
96.00 (-eV)   
9
9.47 (-eV)   
99+
Atom
  
  
Number of Protons
93   
25
37   
99+
Number of Neutrons
144   
14
48   
99+
Number of Electrons
93   
25
37   
99+
Crystal Structure
?
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)   
?
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)   
Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Radius of an Atom
  
  
Atomic Radius
155.00 pm   
30
248.00 pm   
2
Covalent Radius
190.00 pm   
18
220.00 pm   
4
Van der Waals Radius
221.00 pm   
22
303.00 pm   
3
Lattice Constant
666.30 pm   
3
558.50 pm   
10
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Adjacent Atomic Numbers
  
  
Next Element
Plutonium
  
Strontium
  
Previous Element
Uranium
  
Gallium
  
Magnetic Properties
Electrical Properties
  
  
Resistivity
1.22 nΩ·m   
99+
128.00 nΩ·m   
26
Electrical Conductivity
0.01 106/cm Ω   
99+
0.08 106/cm Ω   
24
Electron Affinity
Not Available   
46.90 kJ/mol   
24
Electrical Property
?
Conductor metals have very low resistance to electric currents. They can easily conduct electric current through them.Conductor   
?
Conductor metals have very low resistance to electric currents. They can easily conduct electric current through them.Conductor   
Magnetic Characteristics
  
  
Specific Gravity
20.25   
6
1.53   
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
0.12 J/(kg K)   
40
0.36 J/(kg K)   
17
Thermal Conductivity
6.30 W/m·K   
99+
58.20 W/m·K   
26
Critical Temperature
Not Available   
2,093.00 K   
4
Molar Heat Capacity
29.46 J/mol·K   
8
31.06 J/mol·K   
5
Thermal Expansion
Not Available   
90.00 µm/(m·K)   
2
Standard Molar Entropy
Not Available   
76.80 J/mol.K   
5
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
69.20 kJ/mol   
99+
Enthalpy of Fusion
3.20 kJ/mol   
99+
2.19 kJ/mol   
99+
Enthalpy of Atomization
Not Available   
82.00 kJ/mol   
99+
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