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Neptunium vs Rubidium

Neptunium
Rubidium
Rubidium vs Neptunium


Periodic Table
Symbol
Np   
Rb   
Group Number
Not Available   
1   
17
Period Number
7   
5   
Block
f block   
s block   
Element Family
Actinide   
Alkali   
CAS Number
7439998   
99+
7440177   
99+
Space Group Name
Pnma   
Im_ 3m   
Space Group Number
62.00   
11
229.00   
1
Facts
Interesting Facts
Not Available   
  • Rubidium metal is 16th most common element found in the earth crust.
  • Rubidium metal also found in minerals as well as seawater.
  
Sources
Made by Bombarding Uranium with Neutrons, Ores of metals   
Obtained from Lithium Production.   
History
  
  
Who Discovered
Edwin McMillan and Philip H. Abelson   
Robert Bunsen and Gustav Kirchhoff   
Discovery
In 1940   
In 1861   
Abundance
  
  
Abundance In Universe
Not Available   
1 * 10-6 %   
16
Abundance In Sun
~-9999 %   
~0.000003 %   
17
Abundance In Meteorites
Not Available   
0.00 %   
19
Abundance In Earth's Crust
Not Available   
0.01 %   
18
Abundance In Oceans
Not Available   
0.00 %   
7
Abundance In Humans
Not Available   
0.00 %   
7
Uses
Uses & Benefits
  • Currently known uses of Neptunium metal are limited to research purpose only.
  • Neptunium’s isotope neptunium-237 is used as a neutron detectors.
  
  • Rubidium's main application is in the glass manufacturing.
  • Rubidium can very easily get ionized and hence it is used for ion engines, but it is still less efficient than that of Caesium.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys, Research Purposes   
Biological Properties
  
  
Toxicity
Toxic   
Non Toxic   
Present in Human Body
No   
Yes   
In Blood
0.00 Blood/mg dm-3   
37
2.49 Blood/mg dm-3   
7
In Bone
0.00 p.p.m.   
36
5.00 p.p.m.   
13
Physical Properties
Melting Point
640.00 °C   
99+
38.89 °C   
99+
Boiling Point
3,902.00 °C   
13
688.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Grayish White   
Luster
Metallic   
NA   
Hardness
  
  
Mohs Hardness
Not Available   
0.30   
24
Brinell Hardness
Not Available   
0.22 MPa   
99+
Speed of Sound
Not Available   
1,300.00 m/s   
99+
Optical Properties
  
  
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
4th Energy Level
3,242.00 kJ/mol   
99+
5,080.00 kJ/mol   
18
5th Energy Level
Not Available   
6,850.00 kJ/mol   
19
6th Energy Level
Not Available   
8,140.00 kJ/mol   
20
7th Energy level
Not Available   
9,570.00 kJ/mol   
20
8th Energy Level
Not Available   
13,120.00 kJ/mol   
17
9th Energy Level
Not Available   
14,500.00 kJ/mol   
18
10th Energy Level
Not Available   
26,740.00 kJ/mol   
6
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, Radioactive Isotopes, Radioactivity, Solubility   
Corrosion, Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
93   
25
37   
99+
Electron Configuration
[Rn] 5f4 6d1 7s2   
[Kr] 5s1   
Crystal Structure
Orthorhombic (ORTH)   
Body Centered Cubic (BCC)   
Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
93   
25
37   
99+
Number of Neutrons
144   
14
48   
99+
Number of Electrons
93   
25
37   
99+
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
Atomic Weight
237.00 amu   
22
85.47 amu   
99+
Atomic Volume
11.62 cm3/mol   
99+
55.90 cm3/mol   
2
Adjacent Atomic Numbers
  
  
Previous Element
Uranium
  
Gallium
  
Next Element
Plutonium
  
Strontium
  
Valence Electron Potential
96.00 (-eV)   
9
9.47 (-eV)   
99+
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   
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+
Tensile Strength
125.00 MPa   
14
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.11 (Pa)   
17
Not Available   
Elasticity properties
  
  
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
Ductile   
Ductile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
20.25   
6
1.53   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
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
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.36 J/(kg K)   
17
Molar Heat Capacity
29.46 J/mol·K   
8
31.06 J/mol·K   
5
Thermal Conductivity
6.30 W/m·K   
99+
58.20 W/m·K   
26
Critical Temperature
Not Available   
2,093.00 K   
4
Thermal Expansion
Not Available   
90.00 µm/(m·K)   
2
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+
Standard Molar Entropy
Not Available   
76.80 J/mol.K   
5
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