In the current accepted ____ of the atom, electrons have fixed ____. Electrons ____ the central ____ in shells or energy ____. Each shell is given a number called the principle ____ number. The further a shell is from the nucleus, the ____ its principle quantum number. These shells are ____ up into sub-shells. There are four main ____ of sub-shell: s-, p-, d-, and f-. The sub-shells have different orbitals; ____ of space in which electrons move. Each orbital can hold one ____ of electrons Electrons have an intrinsic property (____). For two electrons in the same orbital, the spin must be ____ to ____ the ____. 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.

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