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Atomic Structure of Protactinium and Calcium

Protactinium
Calcium
Atomic Structure of Calcium and Protactinium


Atomic Properties
Atomic Number
91   
27
20   
99+
Electron Configuration
[Rn] 5f2 6d1 7s2   
[Ar] 4s2   
Crystal Structure
Tetragonal (TETR)   
Face Centered Cubic (FCC)   
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100   
FCC-Crystal-Structure-of-Calcium.jpg#100   
Atom
  
  
Number of Protons
91   
27
20   
99+
Number of Neutrons
122   
21
20   
99+
Number of Electrons
91   
27
20   
99+
Radius of an Atom
  
  
Atomic Radius
163.00 pm   
25
197.00 pm   
6
Covalent Radius
200.00 pm   
11
176.00 pm   
22
Van der Waals Radius
243.00 pm   
11
231.00 pm   
19
Atomic Weight
231.04 amu   
24
40.08 amu   
99+
Atomic Volume
15.00 cm3/mol   
34
29.90 cm3/mol   
7
Adjacent Atomic Numbers
  
  
Previous Element
Thorium
  
Potassium
  
Next Element
Uranium
  
Scandium
  
Valence Electron Potential
92.00 (-eV)   
11
29.00 (-eV)   
99+
Lattice Constant
392.50 pm   
23
558.84 pm   
9
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
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