Home
Compare Metals


Protactinium vs Nobelium


Nobelium vs Protactinium


Periodic Table

Symbol
Pa   
No   

Group Number
Not Available   
Not Available   

Period Number
7   
7   

Block
f block   
f block   

Element Family
Actinide   
Actinide   

CAS Number
7440133   
99+
10028145   
16

Space Group Name
I4/mmm   
Not Available   

Space Group Number
139.00   
8
Not Available   

Facts

Interesting Facts
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
  
  • The most stable isotope of Nobelium metal is No-259.
  • No-259 has a half-life of fifty-eight minutes.
  

Sources
Found in Uranium Ores, Mining, Ores of metals   
Bombarding Curium-246 or Curium-249 with Carbon-12 Nuclei, Found in Minerals, Mining   

History
  
  

Who Discovered
William Crookes   
Joint Institute for Nuclear Research   

Discovery
In 1900   
In 1966   

Abundance
  
  

Abundance In Earth's Crust
0.00 %   
99+
Not Available   

Abundance In Oceans
0.00 %   
99+
Not Available   

Uses

Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
  • Currently known uses of Nobelium metal are limited to research purpose only.
  

Industrial Uses
NA   
NA   

Medical Uses
NA   
NA   

Other Uses
NA   
Research Purposes   

Biological Properties
  
  

Toxicity
Highly Toxic   
Unknown   

Present in Human Body
No   
No   

In Blood
0.00 Blood/mg dm-3   
37
0.00 Blood/mg dm-3   
37

In Bone
0.00 p.p.m.   
36
0.00 p.p.m.   
36

Physical Properties

Melting Point
1,568.00 °C   
21
827.00 °C   
99+

Boiling Point
4,027.00 °C   
12
Not Available   

Appearance
  
  

Physical State
Solid   
Solid   

Color
Silver   
Unknown   

Luster
Metallic   
Unknown Luster   

Hardness
  
  

Speed of Sound
Not Available   
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
Pa   
No   

Isotopes
  
  

Known Isotopes
27   
12
13   
26

Electronegativity
  
  

Pauling Electronegativity
1.50   
27
1.30   
32

Allred Rochow Electronegativity
1.14   
28
1.20   
27

Electropositivity
  
  

Pauling Electropositivity
2.50   
27
2.70   
22

Ionization Energies
  
  

1st Energy Level
568.00 kJ/mol   
99+
642.00 kJ/mol   
99+

2nd Energy Level
1,128.00 kJ/mol   
99+
1,254.00 kJ/mol   
99+

3rd Energy Level
1,814.00 kJ/mol   
99+
2,643.00 kJ/mol   
99+

4th Energy Level
2,991.00 kJ/mol   
99+
3,956.00 kJ/mol   
39

Electrochemical Equivalent
1.72 g/amp-hr   
99+
4.83 g/amp-hr   
4

Electron Work Function
Not Available   
Not Available   

Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Ionization, Radioactive Isotopes, Radioactivity   

Atomic Properties

Atomic Number
91   
27
102   
16

Electron Configuration
[Rn] 5f2 6d1 7s2   
[Rn] 5f14 7s2   

Crystal Structure
Tetragonal (TETR)   
Not Known   

Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100   
Unknown-Crystal-Structure-of-Nobelium.jpg#100   

Atom
  
  

Number of Protons
91   
27
102   
16

Number of Neutrons
122   
21
157   
7

Number of Electrons
91   
27
102   
16

Radius of an Atom
  
  

Atomic Radius
163.00 pm   
25
Not Available   

Covalent Radius
200.00 pm   
11
Not Available   

Van der Waals Radius
243.00 pm   
11
246.00 pm   
8

Atomic Weight
231.04 amu   
24
259.00 amu   
13

Atomic Volume
15.00 cm3/mol   
34
Not Available   

Adjacent Atomic Numbers
  
  

Previous Element
Thorium
  

Next Element
Uranium
  
Lawrencium
  

Valence Electron Potential
92.00 (-eV)   
11
26.00 (-eV)   
99+

Lattice Constant
392.50 pm   
23
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
15.37 g/cm3   
20
Not Available   

Tensile Strength
Not Available   
Not Available   

Viscosity
Not Available   
Not Available   

Vapor Pressure
  
  

Elasticity properties
  
  

Poisson Ratio
Not Available   
Not Available   

Other Mechanical Properties
Unknown   
Unknown   

Magnetic Properties

Magnetic Characteristics
  
  

Specific Gravity
15.37   
12
Not Available   

Magnetic Ordering
Paramagnetic   
Unknown   

Electrical Properties
  
  

Electrical Property
Conductor   
Unknown   

Resistivity
177.00 nΩ·m   
21
Not Available   

Electrical Conductivity
0.05 106/cm Ω   
34
Not Available   

Thermal Properties

Specific Heat
0.12 J/(kg K)   
40
Not Available   

Molar Heat Capacity
Not Available   
Not Available   

Thermal Conductivity
47.00 W/m·K   
32
Not Available   

Critical Temperature
Not Available   
Not Available   

Thermal Expansion
9.90 µm/(m·K)   
40
Not Available   

Enthalpy
  
  

Enthalpy of Fusion
12.34 kJ/mol   
28
Not Available   

Standard Molar Entropy
198.10 J/mol.K   
1
Not Available   

Periodic Table >>
<< All

Compare Actinide Series

Actinide Metals

Actinide Metals

» More Actinide Metals

Compare Actinide Series

» More Compare Actinide Series