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Atomic Structure of Einsteinium and Promethium

Einsteinium
Promethium
Atomic Structure of Promethium and Einsteinium


Atomic
Atomic Number
99  
19
61  
99+
Electron Configuration
[Rn] 5f11 7s2  
[Xe] 4f5 6s2  
Crystal Structure
Face Centered Cubic (FCC)  
Double Hexagonal Close Packed (DHCP)  
Crystal Lattice
FCC-Crystal-Structure-of-Einsteinium.jpg#100  
DHCP-Crystal-Structure-of-Promethium.jpg#100  
Atom
  
  
Number of Protons
99  
19
61  
99+
Number of Neutrons
153  
10
84  
99+
Number of Electrons
99  
19
61  
99+
Radius of an Atom
  
  
Atomic Radius
186.00 pm  
11
183.00 pm  
12
Covalent Radius
186.00 pm  
21
199.00 pm  
12
Van der Waals Radius
0.00 pm  
99+
236.00 pm  
20
Atomic Weight
252.00 amu  
16
145.00 amu  
99+
Atomic Volume
17.04 cm3/mol  
99+
22.39 cm3/mol  
21
Adjacent Atomic Numbers
  
  
Previous Element
Californium
  
Neodymium
  
Next Element
Fermium
  
Samarium
  
Valence Electron Potential
0.00 (-eV)  
99+
44.10 (-eV)  
40
Lattice Constant
582.00 pm  
8
-  
Lattice Angles
-  
-  
Lattice C/A Ratio
1.29  
99+
1.63  
14
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