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Atomic Structure of Calcium and Europium

Calcium
Europium
Atomic Structure of Europium and Calcium


Atomic
Atomic Number
20  
99+
63  
99+
Electron Configuration
[Ar] 4s2  
[Xe] 4f7 6s2  
Crystal Structure
Face Centered Cubic (FCC)  
Body Centered Cubic (BCC)  
Crystal Lattice
FCC-Crystal-Structure-of-Calcium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
20  
99+
63  
99+
Number of Neutrons
20  
99+
89  
39
Number of Electrons
20  
99+
63  
99+
Radius of an Atom
  
  
Atomic Radius
197.00 pm  
8
180.00 pm  
16
Covalent Radius
176.00 pm  
24
198.00 pm  
13
Van der Waals Radius
231.00 pm  
23
233.00 pm  
22
Atomic Weight
40.08 amu  
99+
151.96 amu  
99+
Atomic Volume
29.90 cm3/mol  
10
28.90 cm3/mol  
11
Adjacent Atomic Numbers
  
  
Previous Element
Potassium
  
Samarium
  
Next Element
Scandium
  
Gadolinium
  
Valence Electron Potential
29.00 (-eV)  
99+
45.60 (-eV)  
36
Lattice Constant
558.84 pm  
10
458.10 pm  
19
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.55  
99+
1.58  
35
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