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Atomic Structure of Lanthanum and Samarium


Atomic Structure of Samarium and Lanthanum


Atomic Properties

Atomic Number
57   
99+
62   
99+

Electron Configuration
[Xe] 5d2 6s2   
[Xe] 4f6 6s2   

Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Rhombohedral (RHO)   

Crystal Lattice
DHCP-Crystal-Structure-of-Lanthanum.jpg#100   
RHO-Crystal-Structure-of-Samarium.jpg#100   

Atom
  
  

Number of Protons
57   
99+
62   
99+

Number of Neutrons
82   
99+
88   
39

Number of Electrons
57   
99+
62   
99+

Radius of an Atom
  
  

Atomic Radius
187.00 pm   
8
180.00 pm   
14

Covalent Radius
207.00 pm   
6
198.00 pm   
13

Van der Waals Radius
240.00 pm   
13
229.00 pm   
20

Atomic Weight
138.91 amu   
99+
150.36 amu   
99+

Atomic Volume
20.73 cm3/mol   
16
19.95 cm3/mol   
19

Adjacent Atomic Numbers
  
  

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Barium
  
Promethium
  

Next Element
Cerium
  
Europium
  

Valence Electron Potential
40.71 (-eV)   
99+
44.80 (-eV)   
37

Lattice Constant
377.20 pm   
28
362.10 pm   
33

Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, 2 π/3   

Lattice C/A Ratio
1.62   
2
Not Available   

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