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Atomic Structure of Promethium and Beryllium

Promethium
Beryllium
Atomic Structure of Beryllium and Promethium


Atomic Properties
Atomic Number
61   
99+
4   
99+
Electron Configuration
[Xe] 4f5 6s2   
[He] 2s2   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
DHCP-Crystal-Structure-of-Promethium.jpg#100   
HCP-Crystal-Structure-of-Beryllium.jpg#100   
Atom
  
  
Number of Protons
61   
99+
4   
99+
Number of Neutrons
84   
40
5   
99+
Number of Electrons
61   
99+
4   
99+
Radius of an Atom
  
  
Atomic Radius
183.00 pm   
10
112.00 pm   
99+
Covalent Radius
199.00 pm   
12
96.00 pm   
99+
Van der Waals Radius
236.00 pm   
16
153.00 pm   
99+
Atomic Weight
145.00 amu   
99+
9.01 amu   
99+
Atomic Volume
22.39 cm3/mol   
12
5.00 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Neodymium
  
Lithium
  
Next Element
Samarium
  
Sodium
  
Valence Electron Potential
44.10 (-eV)   
39
82.00 (-eV)   
15
Lattice Constant
Not Available   
228.58 pm   
99+
Lattice Angles
Unknown   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
1.57   
18
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