Atomic Structure of Protactinium and Promethium
Atomic Properties
Atomic Number
91
27
61
99+
Electron Configuration
[Rn] 5f2 6d1 7s2
[Xe] 4f5 6s2
Crystal Structure
Tetragonal (TETR)
Double Hexagonal Close Packed (DHCP)
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100
DHCP-Crystal-Structure-of-Promethium.jpg#100
Atom
Number of Protons
91
27
61
99+
Number of Neutrons
122
21
84
40
Number of Electrons
91
27
61
99+
Radius of an Atom
Atomic Radius
163.00 pm
25
183.00 pm
10
Covalent Radius
200.00 pm
11
199.00 pm
12
Van der Waals Radius
243.00 pm
11
236.00 pm
16
Atomic Weight
231.04 amu
24
145.00 amu
99+
Atomic Volume
15.00 cm3/mol
34
22.39 cm3/mol
12
Adjacent Atomic Numbers
Valence Electron Potential
92.00 (-eV)
11
44.10 (-eV)
39
Lattice Constant
392.50 pm
23
Not Available
Lattice Angles
π/2, π/2, π/2
Unknown
Lattice C/A Ratio
Not Available
Not Available
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