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Rubidium
Rubidium

Neptunium
Neptunium



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Rubidium
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Neptunium

Rubidium Neptunium Comparison

1 Periodic Table
1.1 Symbol
Rb
Np
1.2 Group Number
1NA
Gadolinium Metal
0 17
1.4 Period Number
57
Lithium Metal
2 7
1.7 Block
s block
f block
1.8 Element Family
Alkali
Actinide
1.9 CAS Number
74401777439998
Aluminium Metal
7429905 54386242
2.3 Space Group Name
Im_ 3m
Pnma
2.4 Space Group Number
229.0062.00
Plutonium Metal
11 229
3 Facts
3.1 Interesting Facts
  • Rubidium metal is 16th most common element found in the earth crust.
  • Rubidium metal also found in minerals as well as seawater.
Not Available
3.2 Sources
Obtained from Lithium Production.
Made by Bombarding Uranium with Neutrons, Ores of metals
3.3 History
3.3.1 Who Discovered
Robert Bunsen and Gustav Kirchhoff
Edwin McMillan and Philip H. Abelson
3.3.2 Discovery
In 1861
In 1940
3.4 Abundance
3.4.1 Abundance In Universe
1 * 10-6 %NA
Thallium Metal
5E-09 0.11
4.1.1 Abundance In Sun
~0.000003 %~-9999 %
Beryllium Metal
1E-08 0.1
4.2.1 Abundance In Meteorites
0.00 %NA
Gold Metal
1.7E-07 22
4.6.2 Abundance In Earth's Crust
0.01 %NA
Radium Metal
9.9E-12 8.1
4.7.2 Abundance In Oceans
0.00 %NA
Protactinium Metal
2E-23 1.1
4.7.4 Abundance In Humans
0.00 %NA
Radium Metal
1E-13 1.4
5 Uses
5.1 Uses & Benefits
  • 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.
  • Currently known uses of Neptunium metal are limited to research purpose only.
  • Neptunium’s isotope neptunium-237 is used as a neutron detectors.
5.1.1 Industrial Uses
NA
NA
5.1.2 Medical Uses
NA
NA
5.1.3 Other Uses
Alloys, Research Purposes
Alloys, Nuclear Research, Research Purposes
5.2 Biological Properties
5.2.1 Toxicity
Non Toxic
Toxic
5.2.2 Present in Human Body
5.2.3 In Blood
2.49 Blood/mg dm-30.00 Blood/mg dm-3
Plutonium Metal
0 1970
5.3.3 In Bone
5.00 p.p.m.0.00 p.p.m.
Plutonium Metal
0 170000
6 Physical
6.1 Melting Point
38.89 °C640.00 °C
Francium Metal
27 3410
7.3 Boiling Point
688.00 °C3,902.00 °C
Flerovium Metal
147 5660
7.4 Appearance
7.4.1 Physical State
Solid
Solid
7.4.2 Color
Grayish White
Silver
7.4.3 Luster
NA
Metallic
7.5 Hardness
7.5.1 Mohs Hardness
0.30NA
Cesium Metal
0.2 8.5
7.6.2 Brinell Hardness
0.22 MPaNA
Cesium Metal
0.14 3490
7.10.2 Vickers Hardness
NANA
Palladium Metal
121 3430
8.2 Speed of Sound
1,300.00 m/sNA
Thallium Metal
818 16200
8.4 Optical Properties
8.4.1 Refractive Index
NANA
Mercury Metal
1.000933 1.7229
9.3.2 Reflectivity
NANA
Molybdenum Metal
58 97
9.5 Allotropes
9.5.1 α Allotropes
Not Available
Not Available
9.5.2 β Allotropes
Not Available
Not Available
9.5.3 γ Allotropes
Not Available
Not Available
10 Chemical
10.1 Chemical Formula
Rb
Np
10.2 Isotopes
10.2.1 Known Isotopes
2920
Tennessine Metal
0 38
10.5 Electronegativity
10.5.1 Pauling Electronegativity
0.821.36
Francium Metal
0.7 2.54
10.6.1 Sanderson Electronegativity
0.31NA
Cesium Metal
0.22 2.56
11.2.1 Allred Rochow Electronegativity
0.891.22
Cesium Metal
0.86 1.82
11.2.5 Mulliken-Jaffe Electronegativity
0.69NA
Cesium Metal
0.62 2.48
11.4.3 Allen Electronegativity
0.71NA
Cesium Metal
0.659 2.7
11.5 Electropositivity
11.5.1 Pauling Electropositivity
3.182.64
Gold Metal
1.46 3.3
12.2 Ionization Energies
12.2.1 1st Energy Level
403.00 kJ/mol604.50 kJ/mol
Cesium Metal
375.7 26130
12.5.1 2nd Energy Level
2,633.00 kJ/mol1,128.00 kJ/mol
Ruthenium Metal
710.2162 28750
12.6.1 3rd Energy Level
3,860.00 kJ/mol1,997.00 kJ/mol
Osmium Metal
1600 34230
12.7.1 4th Energy Level
5,080.00 kJ/mol3,242.00 kJ/mol
Thorium Metal
2780 37066
12.8.3 5th Energy Level
6,850.00 kJ/molNA
Dubnium Metal
4305.2 97510
12.8.5 6th Energy Level
8,140.00 kJ/molNA
Seaborgium Metal
5715.8 105800
12.9.1 7th Energy level
9,570.00 kJ/molNA
Bohrium Metal
7226.8 114300
12.9.2 8th Energy Level
13,120.00 kJ/molNA
Hassium Metal
8857.4 125300
12.9.3 9th Energy Level
14,500.00 kJ/molNA
Yttrium Metal
14110 134700
12.9.4 10th Energy Level
26,740.00 kJ/molNA
Strontium Metal
17100 144300
12.9.5 11th Energy Level
NANA
Yttrium Metal
19900 169988
12.9.6 12th Energy Level
NANA
Molybdenum Metal
22219 189368
12.9.7 13th Energy Level
NANA
Molybdenum Metal
26930 76015
12.9.8 14th Energy Level
NANA
Molybdenum Metal
29196 86450
12.9.9 15th Energy Level
NANA
Manganese Metal
41987 97510
12.9.10 16th Energy Level
NANA
Iron Metal
47206 109480
12.9.11 17th Energy Level
NANA
Cobalt Metal
52737 122200
12.9.12 18th Energy Level
NANA
Nickel Metal
58570 134810
12.9.13 19th Energy Level
NANA
Copper Metal
64702 148700
12.9.14 20th Energy Level
NANA
Molybdenum Metal
80400 171200
12.9.15 21st Energy Level
NANA
Molybdenum Metal
87000 179100
12.9.16 22nd Energy Level
NANA
Molybdenum Metal
93400 184900
12.9.17 23rd Energy Level
NANA
Molybdenum Metal
98420 198800
12.9.18 24th Energy Level
NANA
Molybdenum Metal
104400 195200
12.9.19 25th Energy Level
NANA
Molybdenum Metal
121900 121900
12.9.20 26th Energy Level
NANA
Molybdenum Metal
127700 127700
12.9.21 27th Energy Level
NANA
Molybdenum Metal
133800 133800
12.9.22 28th Energy Level
NANA
Molybdenum Metal
139800 139800
12.9.23 29th Energy Level
NANA
Molybdenum Metal
148100 148100
12.9.24 30th Energy Level
NANA
Molybdenum Metal
154500 154500
12.10 Electrochemical Equivalent
3.19 g/amp-hr1.77 g/amp-hr
Beryllium Metal
0.16812 8.3209
12.11 Electron Work Function
2.16 eVNA
Cesium Metal
2.14 5.65
12.12 Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Radioactivity
Ionization, Radioactive Isotopes, Radioactivity, Solubility
13 Atomic
13.1 Atomic Number
3793
Lithium Metal
3 117
13.2 Electron Configuration
[Kr] 5s1
[Rn] 5f4 6d1 7s2
13.3 Crystal Structure
Body Centered Cubic (BCC)
Orthorhombic (ORTH)
13.3.1 Crystal Lattice
13.4 Atom
13.4.1 Number of Protons
3793
Lithium Metal
3 117
13.4.2 Number of Neutrons
48144
Lithium Metal
4 184
13.4.3 Number of Electrons
3793
Lithium Metal
3 117
1.2 Radius of an Atom
1.2.1 Atomic Radius
248.00 pm155.00 pm
Beryllium Metal
112 265
1.2.4 Covalent Radius
220.00 pm190.00 pm
Beryllium Metal
96 260
1.2.6 Van der Waals Radius
303.00 pm221.00 pm
Zinc Metal
139 348
1.4 Atomic Weight
85.47 amu237.00 amu
Lithium Metal
6.94 294
1.5 Atomic Volume
55.90 cm3/mol11.62 cm3/mol
Manganese Metal
1.39 71.07
1.6 Adjacent Atomic Numbers
1.6.1 Previous Element
1.6.2 Next Element
1.7 Valence Electron Potential
9.47 (-eV)96.00 (-eV)
Francium Metal
8 392.42
1.8 Lattice Constant
558.50 pm666.30 pm
Beryllium Metal
228.58 891.25
1.9 Lattice Angles
π/2, π/2, π/2
π/2, π/2, π/2
1.10 Lattice C/A Ratio
NANA
Beryllium Metal
1.567 1.886
2 Mechanical
2.1 Density
2.1.1 Density At Room Temperature
1.53 g/cm319.38 g/cm3
Lithium Metal
0.534 40.7
2.1.2 Density When Liquid (at m.p.)
1.46 g/cm3NA
Lithium Metal
0.512 20
2.2 Tensile Strength
NA125.00 MPa
Indium Metal
2.5 11000
2.3 Viscosity
NANA
Mercury Metal
0.001526 0.001526
2.4 Vapor Pressure
2.4.1 Vapor Pressure at 1000 K
NANA
Cerium Metal
2.47E-11 121
2.4.2 Vapor Pressure at 2000 K
NA0.11 (Pa)
Tungsten Metal
2.62E-10 774
2.5 Elasticity properties
2.5.1 Shear Modulus
NANA
Potassium Metal
1.3 222
2.5.2 Bulk Modulus
2.50 GPaNA
Cesium Metal
1.6 462
2.5.3 Young's Modulus
2.40 GPaNA
Cesium Metal
1.7 528
2.6 Poisson Ratio
NANA
Beryllium Metal
0.032 0.47
2.7 Other Mechanical Properties
Ductile
Ductile
3 Magnetic
3.1 Magnetic Characteristics
3.1.1 Specific Gravity
1.5320.25
Lithium Metal
0.53 4500
3.1.2 Magnetic Ordering
Paramagnetic
Paramagnetic
3.1.3 Permeability
NANA
Bismuth Metal
1.25643E-06 0.0063
3.1.4 Susceptibility
NANA
Bismuth Metal
-0.000166 200000
3.2 Electrical Properties
3.2.1 Electrical Property
Conductor
Conductor
3.2.2 Resistivity
128.00 nΩ·m1.22 nΩ·m
Thallium Metal
0.18 961
3.2.3 Electrical Conductivity
0.08 106/cm Ω0.01 106/cm Ω
Plutonium Metal
0.00666 0.63
3.2.4 Electron Affinity
46.90 kJ/molNA
Mercury Metal
0 222.8
4 Thermal
4.1 Specific Heat
0.36 J/(kg K)0.12 J/(kg K)
Americium Metal
0.11 3.6
4.2 Molar Heat Capacity
31.06 J/mol·K29.46 J/mol·K
Beryllium Metal
16.443 62.7
4.3 Thermal Conductivity
58.20 W/m·K6.30 W/m·K
Palladium
6.3 429
4.4 Critical Temperature
2,093.00 KNA
Ytterbium Metal
26.3 3223
4.5 Thermal Expansion
90.00 µm/(m·K)NA
Tungsten Metal
4.5 97
4.6 Enthalpy
4.6.1 Enthalpy of Vaporization
69.20 kJ/molNA
Zinc Metal
7.32 799.1
4.6.2 Enthalpy of Fusion
2.19 kJ/mol3.20 kJ/mol
Cesium Metal
2.1 35.23
4.6.3 Enthalpy of Atomization
82.00 kJ/molNA
Mercury Metal
61.5 837
4.7 Standard Molar Entropy
76.80 J/mol.KNA
Beryllium Metal
9.5 198.1