Electrons ____ the central ____ in shells. Each shell can hold 2n^2 electrons, where n is the principal ____ number. Electron shells are made up of ____ orbitals, which are ____ in space where electrons may be found. Each shell is composed of one or more orbitals and each orbital can hold one ____ of electrons. There are four main ____ of orbitals: s-, p-, d-, and f-. Electrons have an intrinsic property (____). For two electrons in the same orbital, the spin must be ____ to ____ the ____. Within each shell, orbitals that are of the same energy level are grouped together in sub-____. There are 1 s-orbital, 3 p-orbitals, 5 d-orbitals and 7-p orbitals possible in each subshell. Sub-shells have different ____ levels. Note that ____ is lower in energy than ____, so 4s will ____ first.

Yr 12 Electronic Configuration

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