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Rubidium Properties
Rubidium


Physical
0
Melting Point
38.89 °C 78
Boiling Point
688.00 °C 74
Hardness
0
Mohs Hardness
0.30 24
Brinell Hardness
0.22 MPa 55
Vickers Hardness
Not Available 0
Optical Properties
0
Refractive Index
Not Available 0
Reflectivity
Not Available 0
Speed of Sound
1,300.00 m/s 50
Allotropes
No 0
α Allotropes
Not Available 0
β Allotropes
Not Available 0
γ Allotropes
Not Available 0
Chemical
0
Chemical Formula
Rb 0
Isotopes
0
Known Isotopes
29 10
Electronegativity
0
Pauling Electronegativity
0.82 51
Sanderson Electronegativity
0.31 32
Allred Rochow Electronegativity
0.89 40
Mulliken-Jaffe Electronegativity
0.69 24
Allen Electronegativity
0.71 46
Electropositivity
0
Pauling Electropositivity
3.18 3
Ionization Energies
0
1st Energy Level
403.00 kJ/mol 88
2nd Energy Level
2,633.00 kJ/mol 6
3rd Energy Level
3,860.00 kJ/mol 11
Electrochemical Equivalent
3.19 g/amp-hr 14
Electron Work Function
2.16 eV 45
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Radioactivity 0
Mechanical
0
Density
0
Density At Room Temperature
1.53 g/cm3 81
Density When Liquid (at m.p.)
1.46 g/cm3 56
Vapor Pressure
0
Vapor Pressure at 1000 K
Not Available 0
Vapor Pressure at 2000 K
Not Available 0
Tensile Strength
Not Available 0
Viscosity
Not Available 0
Elasticity properties
0
Shear Modulus
Not Available 0
Bulk Modulus
2.50 GPa 49
Young's Modulus
2.40 GPa 57
Poisson Ratio
Not Available 0
Other Mechanical Properties
Ductile 0
Periodic Table
0
Symbol
Rb 0
Group Number
1 17
Period Number
5 3
Block
s block 0
Element Family
Alkali 0
Atomic
0
Atomic Number
37 75
Atomic Weight
85.47 amu 69
Atomic Volume
55.90 cm3/mol 2
Electron Configuration
[Kr] 5s1 0
Valence Electron Potential
9.47 (-eV) 65
Atom
0
Number of Protons
37 74
Number of Neutrons
48 56
Number of Electrons
37 74
Crystal Structure
Body Centered Cubic (BCC) 0
Crystal Lattice
BCC-Crystal-Structure-.jpg#100 0
Radius of an Atom
0
Atomic Radius
248.00 pm 2
Covalent Radius
220.00 pm 4
Van der Waals Radius
303.00 pm 3
Lattice Constant
558.50 pm 10
Lattice Angles
π/2, π/2, π/2 0
Lattice C/A Ratio
Not Available 0
Adjacent Atomic Numbers
0
Next Element
37 0
Previous Element
24 0
Magnetic
0
Electrical Properties
0
Resistivity
128.00 nΩ·m 26
Electrical Conductivity
0.08 106/cm Ω 24
Electron Affinity
46.90 kJ/mol 24
Electrical Property
Conductor 0
Magnetic Characteristics
0
Specific Gravity
1.53 67
Magnetic Ordering
Paramagnetic 0
Permeability
Not Available 0
Susceptibility
Not Available 0
Thermal
0
Specific Heat
0.36 J/(kg K) 17
Thermal Conductivity
58.20 W/m·K 26
Critical Temperature
2,093.00 K 4
Molar Heat Capacity
31.06 J/mol·K 5
Thermal Expansion
90.00 µm/(m·K) 2
Standard Molar Entropy
76.80 J/mol.K 5
Enthalpy
0
Enthalpy of Vaporization
69.20 kJ/mol 56
Enthalpy of Fusion
2.19 kJ/mol 62
Enthalpy of Atomization
82.00 kJ/mol 59
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