Atomic Structure of Lanthanum and Beryllium
Atomic Properties
Atomic Number
57
99+
4
99+
Electron Configuration
[Xe] 5d2 6s2
[He] 2s2
Crystal Structure
Double Hexagonal Close Packed (DHCP)
Hexagonal Close Packed (HCP)
Crystal Lattice
DHCP-Crystal-Structure-of-Lanthanum.jpg#100
HCP-Crystal-Structure-of-Beryllium.jpg#100
Atom
Number of Protons
57
99+
4
99+
Number of Neutrons
82
99+
5
99+
Number of Electrons
57
99+
4
99+
Radius of an Atom
Atomic Radius
187.00 pm
8
112.00 pm
99+
Covalent Radius
207.00 pm
6
96.00 pm
99+
Van der Waals Radius
240.00 pm
13
153.00 pm
99+
Atomic Weight
138.91 amu
99+
9.01 amu
99+
Atomic Volume
20.73 cm3/mol
16
5.00 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
40.71 (-eV)
99+
82.00 (-eV)
15
Lattice Constant
377.20 pm
28
228.58 pm
99+
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, π/2
Lattice C/A Ratio
1.62
2
1.57
18
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