Rubidium vs Bohrium
Periodic Table
Symbol
Rb
Bh
Group Number
1
17
7
11
Period Number
5
7
Block
s block
d block
Element Family
Alkali
Transition Metal
CAS Number
7440177
99+
54037148
12
Space Group Name
Im_ 3m
Not Available
Space Group Number
229.00
1
Not Available
Facts
Interesting Facts
- Rubidium metal is 16th most common element found in the earth crust.
- Rubidium metal also found in minerals as well as seawater.
- Bohrium metal is also known as Unnilseptium (Uns) and Nielsbohrium (Ns).
Sources
Obtained from Lithium Production.
Found in Minerals, Mining, Synthetically Produced
History
Who Discovered
Robert Bunsen and Gustav Kirchhoff
Gesellschaft für Schwerionenforschung
Discovery
In 1861
In 1981
Abundance
Abundance In Universe
1 * 10-6 %
16
Not Available
Abundance In Sun
~0.000003 %
17
~-9999 %
Abundance In Meteorites
0.00 %
19
Not Available
Abundance In Earth's Crust
0.01 %
18
Not Available
Abundance In Oceans
0.00 %
7
Not Available
Abundance In Humans
0.00 %
7
Not Available
Uses
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 Bohrium metal are limited to research purpose only.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
Alloys, Research Purposes
Research Purposes
Biological Properties
Toxicity
Non Toxic
Unknown
Present in Human Body
Yes
No
In Blood
2.49 Blood/mg dm-3
7
0.00 Blood/mg dm-3
37
In Bone
5.00 p.p.m.
13
0.00 p.p.m.
36
Physical Properties
Melting Point
38.89 °C
99+
Not Available
Boiling Point
688.00 °C
99+
Not Available
Appearance
Physical State
Solid
Solid
Color
Grayish White
Unknown
Luster
NA
Unknown Luster
Hardness
Mohs Hardness
0.30
24
Not Available
Brinell Hardness
0.22 MPa
99+
Not Available
Speed of Sound
1,300.00 m/s
99+
Not Available
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
Rb
Bh
Isotopes
Known Isotopes
29
10
5
32
Electronegativity
Pauling Electronegativity
0.82
99+
Not Available
Sanderson Electronegativity
0.31
32
Not Available
Allred Rochow Electronegativity
0.89
40
Not Available
Mulliken-Jaffe Electronegativity
0.69
24
Not Available
Allen Electronegativity
0.71
99+
Not Available
Electropositivity
Pauling Electropositivity
3.18
3
Not Available
Ionization Energies
1st Energy Level
403.00 kJ/mol
99+
742.90 kJ/mol
23
2nd Energy Level
2,633.00 kJ/mol
6
1,688.50 kJ/mol
30
3rd Energy Level
3,860.00 kJ/mol
11
2,566.50 kJ/mol
99+
4th Energy Level
5,080.00 kJ/mol
18
3,598.90 kJ/mol
99+
5th Energy Level
6,850.00 kJ/mol
19
4,727.80 kJ/mol
37
6th Energy Level
8,140.00 kJ/mol
20
5,991.70 kJ/mol
24
7th Energy level
9,570.00 kJ/mol
20
7,226.80 kJ/mol
22
8th Energy Level
13,120.00 kJ/mol
17
Not Available
9th Energy Level
14,500.00 kJ/mol
18
Not Available
10th Energy Level
26,740.00 kJ/mol
6
Not Available
Electrochemical Equivalent
3.19 g/amp-hr
14
Not Available
Electron Work Function
2.16 eV
99+
Not Available
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Radioactivity
Ionization, Radioactive Isotopes
Atomic Properties
Atomic Number
37
99+
107
11
Electron Configuration
[Kr] 5s1
[Rn] 5f14 6d5 7s2
Crystal Structure
Body Centered Cubic (BCC)
Hexagonal Close Packed (HCP)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
37
99+
107
11
Number of Neutrons
48
99+
155
8
Number of Electrons
37
99+
107
11
Radius of an Atom
Atomic Radius
248.00 pm
2
128.00 pm
99+
Covalent Radius
220.00 pm
4
141.00 pm
99+
Van der Waals Radius
303.00 pm
3
Not Available
Atomic Weight
85.47 amu
99+
270.00 amu
8
Atomic Volume
55.90 cm3/mol
2
Not Available
Adjacent Atomic Numbers
Valence Electron Potential
9.47 (-eV)
99+
Not Available
Lattice Constant
558.50 pm
10
Not Available
Lattice Angles
π/2, π/2, π/2
NA
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
1.53 g/cm3
99+
37.10 g/cm3
3
Density When Liquid (at m.p.)
1.46 g/cm3
99+
Not Available
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Bulk Modulus
2.50 GPa
99+
Not Available
Young's Modulus
2.40 GPa
99+
Not Available
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
Ductile
Unknown
Magnetic Properties
Magnetic Characteristics
Specific Gravity
1.53
99+
Not Available
Magnetic Ordering
Paramagnetic
Unknown
Electrical Properties
Electrical Property
Conductor
Unknown
Resistivity
128.00 nΩ·m
26
Not Available
Electrical Conductivity
0.08 106/cm Ω
24
Not Available
Electron Affinity
46.90 kJ/mol
24
Not Available
Thermal Properties
Specific Heat
0.36 J/(kg K)
17
Not Available
Molar Heat Capacity
31.06 J/mol·K
5
Not Available
Thermal Conductivity
58.20 W/m·K
26
Not Available
Critical Temperature
2,093.00 K
4
Not Available
Thermal Expansion
90.00 µm/(m·K)
2
Not Available
Enthalpy
Enthalpy of Vaporization
69.20 kJ/mol
99+
Not Available
Enthalpy of Fusion
2.19 kJ/mol
99+
Not Available
Enthalpy of Atomization
82.00 kJ/mol
99+
Not Available
Standard Molar Entropy
76.80 J/mol.K
5
Not Available
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