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Atomic Structure of Calcium and Technetium

Calcium
Technetium
Atomic Structure of Technetium and Calcium


Atomic Properties
Atomic Number
20   
99+
43   
99+
Electron Configuration
[Ar] 4s2   
[Kr] 4d5 5s2   
Crystal Structure
Face Centered Cubic (FCC)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
FCC-Crystal-Structure-of-Calcium.jpg#100   
HCP-Crystal-Structure-of-Technetium.jpg#100   
Atom
  
  
Number of Protons
20   
99+
43   
99+
Number of Neutrons
20   
99+
55   
99+
Number of Electrons
20   
99+
43   
99+
Radius of an Atom
  
  
Atomic Radius
197.00 pm   
6
136.00 pm   
99+
Covalent Radius
176.00 pm   
22
147.00 pm   
37
Van der Waals Radius
231.00 pm   
19
200.00 pm   
28
Atomic Weight
40.08 amu   
99+
98.00 amu   
99+
Atomic Volume
29.90 cm3/mol   
7
8.50 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Potassium
  
Molybdenum
  
Next Element
Scandium
  
Ruthenium
  
Valence Electron Potential
29.00 (-eV)   
99+
180.00 (-eV)   
3
Lattice Constant
558.84 pm   
9
273.50 pm   
99+
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.60   
5
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