Electron shells are arranged into sub-orbitals (s, p, d and f), each of which can contain two electrons spinning in opposite directions due to the Pauli exclusion principle. When filling orbitals the lowest energy orbitals will be filled first (e.g. 1s before 2s).You cannot go to the next orbital unless the previous orbital is half or completely filled.
Orbital How many orbitals does it hold Max Number of Electrons
S 1 2 P 3 6 D 5 10 F 7 14
E.g. electron configuration of Carbon (6 electrons): 1s2 2s2 2p2 Exceptions: Chromium (24 electrons) 1s2,2s2,2p6,3s2,3p6,3d5,4s1 Copper (29 electrons) 1s2 2s2 2p6 3s2 3p6 4s1 3d10
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