Atomic Structure of Promethium and Beryllium
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
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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