Unit 4

Electrons In Atoms

Electron Configuration

Electron Configurations are the way electrons are arranged in various orbitals around the nuclei of atoms.

The coordinates for where electrons are located within the atom.

Includes the energy level, sublevel, orbital, and spin of each electron.

Orbital Notation

For each sub-shell we'll first draw the corresponding number of orbitals (circles) above them. Next we'll fill in the electrons represented as arrows. Distribute electrons evenly to orbitals with a given sub-shell first before any pairing occurs.
  • s sub-shells have 1 orbital
  • p sub-shells have 3 orbitals
  • d sub-shells have 5 orbitals
  • f sub-shells have 7 orbitals
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