Atomic Structure of Promethium and Americium
Atomic Properties
Atomic Number
61
99+
95
23
Electron Configuration
[Xe] 4f5 6s2
[Rn] 5f7 7s2
Crystal Structure
Double Hexagonal Close Packed (DHCP)
Double Hexagonal Close Packed (DHCP)
Crystal Lattice
DHCP-Crystal-Structure-of-Promethium.jpg#100
DHCP-Crystal-Structure-of-Americium.jpg#100
Atom
Number of Protons
61
99+
95
23
Number of Neutrons
84
40
148
12
Number of Electrons
61
99+
95
23
Radius of an Atom
Atomic Radius
183.00 pm
10
173.00 pm
21
Covalent Radius
199.00 pm
12
180.00 pm
21
Van der Waals Radius
236.00 pm
16
244.00 pm
10
Atomic Weight
145.00 amu
99+
243.00 amu
20
Atomic Volume
22.39 cm3/mol
12
17.86 cm3/mol
29
Adjacent Atomic Numbers
Valence Electron Potential
44.10 (-eV)
39
44.00 (-eV)
40
Lattice Constant
Not Available
346.81 pm
99+
Lattice Angles
Unknown
π/2, π/2, 2 π/3
Lattice C/A Ratio
Not Available
Not Available
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