In class, they say it's because half-filled and fully filled d-subshells give extra stability—so chromium takes one electron from 4s to make 3d⁵, and copper does it for 3d¹⁰. But sitting here watching the river, I think nature just prefers a balanced load, like when my cousin stacks the apple crates so they don't topple. It’s all about finding the steadiest arrangement, even if the rulebook says otherwise.
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