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== Answer
== Generally, each sub-shell has its own energy. The sub-shells, listed in order of energy with the number of orbitals in that sub-shell, with the number of electrons each one occupies, are:

1s: 1 orbital, 2 electrons
2s: 1 orbital, 2 electrons
2p: 3 orbitals, 6 electrons
3s: 1 orbital, 2 electrons
3p: 3 orbitals, 6 electrons
4s: 1 orbital, 2 electrons
3d: 5 orbitals, 10 electrons
4p: 3 orbitals, 6 electrons
etc.

So, in the first four separate energy levels or sub-shell (1s, 2s, 2p, and 3s) there are 2 + 2+ 6 + 2 = 12 electrons. Note that in these first four sub-shells there are 6 orbitals (with 2 electrons each).

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