Curium Rubidium Comparison
Periodic Table
Symbol
Cm
Rb
Group Number
Not Available
1
17
Period Number
7
5
Block
f block
s block
Element Family
Actinide
Alkali
CAS Number
7440519
36
7440177
99+
Space Group Name
Not Available
Im_ 3m
Space Group Number
Not Available
229.00
1
Facts
Interesting Facts
- Curium metal does not occur free in nature.
- Curium metal is a synthetically produced metal.
- Rubidium metal is 16th most common element found in the earth crust.
- Rubidium metal also found in minerals as well as seawater.
Sources
Bombarding Plutonium with Helium Ions
Obtained from Lithium Production.
History
Who Discovered
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso
Robert Bunsen and Gustav Kirchhoff
Discovery
In 1944
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
- Curium metal is used to provide power to electrical equipment for space missions.
- 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
Research Purposes
Alloys, Research Purposes
Biological Properties
Toxicity
Unknown
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
1,340.00 °C
34
38.89 °C
99+
Boiling Point
3,110.00 °C
30
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
Cm
Rb
Isotopes
Known Isotopes
15
24
29
10
Electronegativity
Pauling Electronegativity
1.30
32
0.82
99+
Sanderson Electronegativity
Not Available
0.31
32
Allred Rochow Electronegativity
1.20
27
0.89
40
Mulliken-Jaffe Electronegativity
Not Available
0.69
24
Allen Electronegativity
Not Available
0.71
99+
Electropositivity
Pauling Electropositivity
2.70
22
3.18
3
Ionization Energies
1st Energy Level
581.00 kJ/mol
99+
403.00 kJ/mol
99+
2nd Energy Level
1,196.00 kJ/mol
99+
2,633.00 kJ/mol
6
3rd Energy Level
2,026.00 kJ/mol
99+
3,860.00 kJ/mol
11
4th Energy Level
3,550.00 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
3.07 g/amp-hr
16
3.19 g/amp-hr
14
Electron Work Function
Not Available
2.16 eV
99+
Other Chemical Properties
Ionization, Radioactive Isotopes
Corrosion, Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
96
22
37
99+
Electron Configuration
[Rn] 5f7 6d1 7s2
[Kr] 5s1
Crystal Structure
Double Hexagonal Close Packed (DHCP)
Body Centered Cubic (BCC)
Crystal Lattice
DHCP-Crystal-Structure-of-Curium.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
96
22
37
99+
Number of Neutrons
151
10
48
99+
Number of Electrons
96
22
37
99+
Radius of an Atom
Atomic Radius
174.00 pm
20
248.00 pm
2
Covalent Radius
169.00 pm
26
220.00 pm
4
Van der Waals Radius
200.00 pm
28
303.00 pm
3
Atomic Weight
247.00 amu
18
85.47 amu
99+
Atomic Volume
18.28 cm3/mol
26
55.90 cm3/mol
2
Adjacent Atomic Numbers
Valence Electron Potential
44.50 (-eV)
38
9.47 (-eV)
99+
Lattice Constant
Not Available
558.50 pm
10
Lattice Angles
NA
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
13.51 g/cm3
25
1.53 g/cm3
99+
Density When Liquid (at m.p.)
13.85 g/cm3
10
1.46 g/cm3
99+
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
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
Unknown
Ductile
Magnetic Properties
Magnetic Characteristics
Specific Gravity
13.51
17
1.53
99+
Magnetic Ordering
Antiferromagnetic
Paramagnetic
Electrical Properties
Electrical Property
Unknown
Conductor
Resistivity
1.25 nΩ·m
99+
128.00 nΩ·m
26
Electrical Conductivity
Not Available
0.08 106/cm Ω
24
Electron Affinity
Not Available
46.90 kJ/mol
24
Thermal Properties
Specific Heat
Not Available
0.36 J/(kg K)
17
Molar Heat Capacity
Not Available
31.06 J/mol·K
5
Thermal Conductivity
Not Available
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
15.00 kJ/mol
21
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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