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Atomic Structure of Samarium and Thulium


Atomic Structure of Thulium and Samarium


Atomic Properties

Atomic Number
62   
99+
69   
99+

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

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

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

Atom
  
  

Number of Protons
62   
99+
69   
99+

Number of Neutrons
88   
39
100   
32

Number of Electrons
62   
99+
69   
99+

Radius of an Atom
  
  

Atomic Radius
180.00 pm   
14
176.00 pm   
18

Covalent Radius
198.00 pm   
13
160.00 pm   
30

Van der Waals Radius
229.00 pm   
20
Not Available   

Atomic Weight
150.36 amu   
99+
168.93 amu   
99+

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

Adjacent Atomic Numbers
  
  

Previous Element
Promethium
  
Erbium
  

Next Element
Europium
  
Ytterbium
  

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

Lattice Constant
362.10 pm   
33
353.75 pm   
40

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

Lattice C/A Ratio
Not Available   
1.57   
17

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