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Atomic Structure of Calcium and Protactinium

Calcium
Protactinium
Atomic Structure of Protactinium and Calcium


Atomic Properties
Atomic Number
20   
99+
91   
27
Electron Configuration
[Ar] 4s2   
[Rn] 5f2 6d1 7s2   
Crystal Structure
Face Centered Cubic (FCC)   
Tetragonal (TETR)   
Crystal Lattice
FCC-Crystal-Structure-of-Calcium.jpg#100   
TETR-Crystal-Structure-of-Protactinium.jpg#100   
Atom
  
  
Number of Protons
20   
99+
91   
27
Number of Neutrons
20   
99+
122   
21
Number of Electrons
20   
99+
91   
27
Radius of an Atom
  
  
Atomic Radius
197.00 pm   
6
163.00 pm   
25
Covalent Radius
176.00 pm   
22
200.00 pm   
11
Van der Waals Radius
231.00 pm   
19
243.00 pm   
11
Atomic Weight
40.08 amu   
99+
231.04 amu   
24
Atomic Volume
29.90 cm3/mol   
7
15.00 cm3/mol   
34
Adjacent Atomic Numbers
  
  
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Potassium
  
Thorium
  
Next Element
Scandium
  
Uranium
  
Valence Electron Potential
29.00 (-eV)   
99+
92.00 (-eV)   
11
Lattice Constant
558.84 pm   
9
392.50 pm   
23
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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