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Atomic Structure of Thulium and Samarium


Atomic Structure of Samarium and Thulium


Atomic Properties

Atomic Number
69   
99+
62   
99+

Electron Configuration
[Xe] 4f13 6s2   
[Xe] 4f6 6s2   

Crystal Structure
Hexagonal Close Packed (HCP)   
Rhombohedral (RHO)   

Crystal Lattice
HCP-Crystal-Structure-of-Thulium.jpg#100   
RHO-Crystal-Structure-of-Samarium.jpg#100   

Atom
  
  

Number of Protons
69   
99+
62   
99+

Number of Neutrons
100   
32
88   
39

Number of Electrons
69   
99+
62   
99+

Radius of an Atom
  
  

Atomic Radius
176.00 pm   
18
180.00 pm   
14

Covalent Radius
160.00 pm   
30
198.00 pm   
13

Van der Waals Radius
Not Available   
229.00 pm   
20

Atomic Weight
168.93 amu   
99+
150.36 amu   
99+

Atomic Volume
18.10 cm3/mol   
28
19.95 cm3/mol   
19

Adjacent Atomic Numbers
  
  

Previous Element
Erbium
  
Promethium
  

Next Element
Ytterbium
  
Europium
  

Valence Electron Potential
49.70 (-eV)   
28
44.80 (-eV)   
37

Lattice Constant
353.75 pm   
40
362.10 pm   
33

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

Lattice C/A Ratio
1.57   
17
Not Available   

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