When a person is on a journey, it is always nice to have a specific problem to solve. I have found one in the middle of the Transition Metals.
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July 5, 2011
Most atoms first fill the electron orbitals that use the least amount of energy; then they fill the higher energy orbitals. Fairly recently, it was discovered that several exceptions to this rule exist in the Transition Metals.
According to Atomic Number, the frist exception is Chromium. Keeping in line with the typical rule, its electron configuration should be:
1s2 2s2 2p6 3s2 3p6 4s2 3d4
Instead, Chromium follows the electron orbital structure:
1s2 2s2 2p6 3s2 3p6 4s1 3d5
Why this happens is being disputed in the current quantum mechanics community. In our current periodic table, there are nine exceptions in the first 56 elements. Very interesting indeed!
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