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Curium vs Niobium

Curium
Niobium
Niobium vs Curium


Periodic Table
Symbol
Cm   
Nb   
Group Number
Not Available   
5   
13
Period Number
7   
5   
Block
f block   
d block   
Element Family
Actinide   
Transition Metal   
CAS Number
7440519   
36
7440031   
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.
  
  • Niobium metal was used to get called Columbium in past.
  • Niobium metal found freely in nature (abundance).
  
Sources
Bombarding Plutonium with Helium Ions   
By-product of Tin Extraction, Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso   
Charles Hatchett   
Discovery
In 1944   
In 1801   
Abundance
  
  
Abundance In Universe
Not Available   
2 * 10-7 %   
22
Abundance In Sun
~-9999 %   
~0.0000004 %   
23
Abundance In Meteorites
Not Available   
0.00 %   
35
Abundance In Earth's Crust
Not Available   
0.00 %   
25
Abundance In Oceans
Not Available   
0.00 %   
34
Uses
Uses & Benefits
  • Curium metal is used to provide power to electrical equipment for space missions.
  
  • Niobium alloys are used in jet engines and rockets and spacecraft, beams and girders for buildings and oil and gas pipelines.
  • It is used superconducting magnets in particles accelerators, NMR and MRI equipment.
  
Industrial Uses
NA   
Aerospace Industry, Ammunition Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Research Purposes   
Alloys   
Biological Properties
  
  
Toxicity
Unknown   
Low Toxic   
Present in Human Body
No   
Yes   
In Blood
0.00 Blood/mg dm-3   
37
0.01 Blood/mg dm-3   
25
In Bone
0.00 p.p.m.   
36
0.07 p.p.m.   
25
Physical Properties
Melting Point
1,340.00 °C   
34
2,468.00 °C   
6
Boiling Point
3,110.00 °C   
30
2,468.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Gray   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
6.00   
6
Brinell Hardness
Not Available   
735.00 MPa   
14
Vickers Hardness
Not Available   
870.00 MPa   
12
Speed of Sound
Not Available   
3,480.00 m/s   
21
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   
Nb   
Isotopes
  
  
Known Isotopes
15   
24
17   
22
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
1.60   
23
Sanderson Electronegativity
Not Available   
1.42   
16
Allred Rochow Electronegativity
1.20   
27
1.23   
25
Allen Electronegativity
Not Available   
1.41   
31
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
2.40   
31
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol   
99+
652.10 kJ/mol   
99+
2nd Energy Level
1,196.00 kJ/mol   
99+
1,380.00 kJ/mol   
99+
3rd Energy Level
2,026.00 kJ/mol   
99+
2,416.00 kJ/mol   
99+
4th Energy Level
3,550.00 kJ/mol   
99+
3,700.00 kJ/mol   
99+
5th Energy Level
Not Available   
4,877.00 kJ/mol   
36
6th Energy Level
Not Available   
9,847.00 kJ/mol   
11
7th Energy level
Not Available   
12,100.00 kJ/mol   
14
Electrochemical Equivalent
3.07 g/amp-hr   
16
0.69 g/amp-hr   
99+
Electron Work Function
Not Available   
4.30 eV   
18
Other Chemical Properties
Ionization, Radioactive Isotopes   
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
96   
22
41   
99+
Electron Configuration
[Rn] 5f7 6d1 7s2   
[Kr] 4d4 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
41   
99+
Number of Neutrons
151   
10
52   
99+
Number of Electrons
96   
22
41   
99+
Radius of an Atom
  
  
Atomic Radius
174.00 pm   
20
146.00 pm   
35
Covalent Radius
169.00 pm   
26
164.00 pm   
28
Van der Waals Radius
200.00 pm   
28
200.00 pm   
28
Atomic Weight
247.00 amu   
18
92.91 amu   
99+
Atomic Volume
18.28 cm3/mol   
26
10.87 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Americium
  
Zirconium
  
Next Element
Berkelium
  
Molybdenum
  
Valence Electron Potential
44.50 (-eV)   
38
104.00 (-eV)   
8
Lattice Constant
Not Available   
330.04 pm   
99+
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
8.57 g/cm3   
99+
Density When Liquid (at m.p.)
13.85 g/cm3   
10
Not Available   
Tensile Strength
Not Available   
330.00 MPa   
12
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available   
0.00 (Pa)   
27
Elasticity properties
  
  
Shear Modulus
Not Available   
38.00 GPa   
19
Bulk Modulus
Not Available   
170.00 GPa   
10
Young's Modulus
Not Available   
105.00 GPa   
20
Poisson Ratio
Not Available   
0.40   
4
Other Mechanical Properties
Unknown   
Ductile, Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
13.51   
17
8.57   
37
Magnetic Ordering
Antiferromagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Unknown   
Conductor   
Resistivity
1.25 nΩ·m   
99+
152.00 nΩ·m   
23
Electrical Conductivity
Not Available   
0.07 106/cm Ω   
28
Electron Affinity
Not Available   
86.10 kJ/mol   
12
Thermal Properties
Specific Heat
Not Available   
0.26 J/(kg K)   
20
Molar Heat Capacity
Not Available   
24.60 J/mol·K   
99+
Thermal Conductivity
Not Available   
53.70 W/m·K   
29
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
7.30 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
696.60 kJ/mol   
4
Enthalpy of Fusion
15.00 kJ/mol   
21
27.20 kJ/mol   
6
Enthalpy of Atomization
Not Available   
745.00 kJ/mol   
4
Standard Molar Entropy
Not Available   
36.40 J/mol.K   
99+
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