It is excellent for the first 20 elements, up to calcium. And a good way to learn about valences of the elements. It doesn't work too well after that because the new orbitals hold more electrons, and would be very difficult to sort out. The d orbitals hold 10 electrons the f orbitals hold 14 electrons. Plus that some of the orbitals do not follow simple rules in filling..
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It is excellent for the first 20 elements, up to calcium. And a good way to learn about valences of the elements. It doesn't work too well after that because the new orbitals hold more electrons, and would be very difficult to sort out. The d orbitals hold 10 electrons the f orbitals hold 14 electrons. Plus that some of the orbitals do not follow simple rules in filling..