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Atomic Structure of Beryllium and Promethium

Beryllium
Promethium
Atomic Structure of Promethium and Beryllium


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