Rubidium vs Actinium
Periodic Table
Symbol
Rb
Ac
Group Number
1
17
Not Available
Period Number
5
7
Block
s block
f block
Element Family
Alkali
Actinide
CAS Number
7440177
99+
7440348
99+
Space Group Name
Im_ 3m
Fm_ 3m
Space Group Number
229.00
1
225.00
2
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.
Not Available
Sources
Obtained from Lithium Production.
Obtained by Treating Radium with Neutrons, Ores of metals
History
Who Discovered
Robert Bunsen and Gustav Kirchhoff
Friedrich Oskar Giesel
Discovery
In 1861
In 1902
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.
- Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
Alloys, Research Purposes
Alloys, Nuclear Research, Research Purposes
Biological Properties
Toxicity
Non Toxic
Toxic
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+
1,227.00 °C
38
Boiling Point
688.00 °C
99+
3,200.00 °C
26
Appearance
Physical State
Solid
Solid
Color
Grayish White
Silvery White
Luster
NA
NA
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
Ac
Isotopes
Known Isotopes
29
10
29
10
Electronegativity
Pauling Electronegativity
0.82
99+
1.10
99+
Sanderson Electronegativity
0.31
32
Not Available
Allred Rochow Electronegativity
0.89
40
1.00
36
Mulliken-Jaffe Electronegativity
0.69
24
Not Available
Allen Electronegativity
0.71
99+
Not Available
Electropositivity
Pauling Electropositivity
3.18
3
2.90
10
Ionization Energies
1st Energy Level
403.00 kJ/mol
99+
499.00 kJ/mol
99+
2nd Energy Level
2,633.00 kJ/mol
6
1,170.00 kJ/mol
99+
3rd Energy Level
3,860.00 kJ/mol
11
1,900.00 kJ/mol
99+
4th Energy Level
5,080.00 kJ/mol
18
4,700.00 kJ/mol
23
5th Energy Level
6,850.00 kJ/mol
19
Not Available
6th Energy Level
8,140.00 kJ/mol
20
Not Available
7th Energy level
9,570.00 kJ/mol
20
Not Available
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
2.82 g/amp-hr
18
Electron Work Function
2.16 eV
99+
Not Available
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Radioactivity
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
37
99+
89
29
Electron Configuration
[Kr] 5s1
[Rn] 6d1 7s2
Crystal Structure
Body Centered Cubic (BCC)
Face Centered Cubic (FCC)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
FCC-Crystal-Structure-of-Actinium.jpg#100
Atom
Number of Protons
37
99+
89
29
Number of Neutrons
48
99+
138
16
Number of Electrons
37
99+
89
29
Radius of an Atom
Atomic Radius
248.00 pm
2
195.00 pm
7
Covalent Radius
220.00 pm
4
Not Available
Van der Waals Radius
303.00 pm
3
Not Available
Atomic Weight
85.47 amu
99+
227.00 amu
25
Atomic Volume
55.90 cm3/mol
2
22.54 cm3/mol
11
Adjacent Atomic Numbers
Valence Electron Potential
9.47 (-eV)
99+
38.60 (-eV)
99+
Lattice Constant
558.50 pm
10
567.00 pm
8
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
1.53 g/cm3
99+
10.00 g/cm3
37
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
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
1.53
99+
10.07
28
Magnetic Ordering
Paramagnetic
Paramagnetic
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
0.12 J/(kg K)
40
Molar Heat Capacity
31.06 J/mol·K
5
27.20 J/mol·K
18
Thermal Conductivity
58.20 W/m·K
26
12.00 W/m·K
99+
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+
301.00 kJ/mol
36
Standard Molar Entropy
76.80 J/mol.K
5
56.50 J/mol.K
25
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