Atomic Structure of Promethium and Fermium
Atomic Properties
Atomic Number
61
99+
100
18
Electron Configuration
[Xe] 4f5 6s2
[Rn] 5f12 7s2
Crystal Structure
Double Hexagonal Close Packed (DHCP)
Not Known
Crystal Lattice
DHCP-Crystal-Structure-of-Promethium.jpg#100
Unknown-Crystal-Structure-of-Fermium.jpg#100
Atom
Number of Protons
61
99+
100
18
Number of Neutrons
84
40
157
7
Number of Electrons
61
99+
100
18
Radius of an Atom
Atomic Radius
183.00 pm
10
Not Available
Covalent Radius
199.00 pm
12
Not Available
Van der Waals Radius
236.00 pm
16
245.00 pm
9
Atomic Weight
145.00 amu
99+
257.00 amu
15
Atomic Volume
22.39 cm3/mol
12
Not Available
Adjacent Atomic Numbers
Valence Electron Potential
44.10 (-eV)
39
Not Available
Lattice Constant
Not Available
Not Available
Lattice Angles
Unknown
NA
Lattice C/A Ratio
Not Available
Not Available
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