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Atomic Structure of Lanthanum and Americium


Atomic Structure of Americium and Lanthanum


Atomic Properties

Atomic Number
57   
99+
95   
23

Electron Configuration
[Xe] 5d2 6s2   
[Rn] 5f7 7s2   

Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Double Hexagonal Close Packed (DHCP)   

Crystal Lattice
DHCP-Crystal-Structure-of-Lanthanum.jpg#100   
DHCP-Crystal-Structure-of-Americium.jpg#100   

Atom
  
  

Number of Protons
57   
99+
95   
23

Number of Neutrons
82   
99+
148   
12

Number of Electrons
57   
99+
95   
23

Radius of an Atom
  
  

Atomic Radius
187.00 pm   
8
173.00 pm   
21

Covalent Radius
207.00 pm   
6
180.00 pm   
21

Van der Waals Radius
240.00 pm   
13
244.00 pm   
10

Atomic Weight
138.91 amu   
99+
243.00 amu   
20

Atomic Volume
20.73 cm3/mol   
16
17.86 cm3/mol   
29

Adjacent Atomic Numbers
  
  

Previous Element
Barium
  
Plutonium
  

Next Element
Cerium
  
Curium
  

Valence Electron Potential
40.71 (-eV)   
99+
44.00 (-eV)   
40

Lattice Constant
377.20 pm   
28
346.81 pm   
99+

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

Lattice C/A Ratio
1.62   
2
Not Available   

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