Electronic Structure of Atoms
Electron configurations and the periodic table
Electron Configurations and the Periodic Table
The periodic table is structured so that elements with the same type of valence electron configuration are arranged in columns.
These two groups comprise the main-group elements
Important facts to remember:
What is the electron configuration for the element Niobium? (41)
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d3
Niobium is actually:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d4
The reason is that the 5s and 4d energy levels are quite close and certain electronic arrangements can result in the levels being slightly different than expected.
What is the electron configuration of the element Nickel? (28)
1s2 2s2 2p6 3s2 3p6 4s2 3d8
What is the electron configuration for Nickel in terms of the nearest noble gas?
[Ar] 4s2 3d8
How would the last valence orbital be filled?
1996 Michael Blaber