v 6.30.00
28 Jan 2022
updated 28 Jan 2022

Anomalous electronic configurations

In connection with the predicted configurations, please note that in mid-form tables Lutetium is generally represented as a Lanthanide, and Lawrencium likewise represented as an Actinide.

Period 4First (d) transition series
 Chromium[Ar] 3d4 4s2[Ar] 3d5 4s1
 Copper[Ar] 3d9 4s2[Ar] 3d10 4s1
Period 5Second (d) transition series
 Niobium[Kr] 4d3 5s2 [Kr] 4d4 5s1
 Molybdenum[Kr] 4d4 5s2 [Kr] 4d5 5s1
 Ruthenium[Kr] 4d6 5s2 [Kr] 4d7 5s1
 Rhodium[Kr] 4d7 5s2 [Kr] 4d8 5s1
 Palladium[Kr] 4d8 5s2 [Kr] 4d10 5s0
 Silver[Kr] 4d9 5s2 [Kr] 4d10 5s1
Period 6Lanthanide (f) series
 Lanthanum[Xe] 4f1 6s2 [Xe] 5d1 6s2
 Cerium[Xe] 4f2 6s2 [Xe] 4f1 5d1 6s2
 Gadolinium[Xe] 4f8 6s2 [Xe] 4f7 5d1 6s2
Period 6Third (d) transition series
 Platinum[Xe] 4f14 5d8 6s2 [Xe] 4f14 5d9 6s1
 Gold[Xe] 4f14 5d9 6s2 [Xe] 4f14 5d10 6s1
Period 7Actinide (f) series
 Actinium[Rn] 5f1 7s2 [Rn] 6d1 7s2
 Thorium[Rn] 5f2 7s2 [Rn] 6d2 7s2
 Protactinium[Rn] 5f3 7s2 [Rn] 5f2 6d1 7s2
 Uranium[Rn] 5f4 7s2 [Rn] 5f3 6d1 7s2
 Neptunium[Rn] 5f5 7s2 [Rn] 5f4 6d1 7s2
 Curium[Rn] 5f8 7s2 [Rn] 5f7 6d1 7s2
NBHelium 1s2
 Neon [He] 2s2 2p6
 Argon [Ne] 3s2 3p6
 Krypton [Ar] 3d10 4s2 4p6
 Xenon [Kr] 4d10 5s2 5p6
 Radon [Xe] 4f14 5d10 6s2 6p6