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Up and down arrows in boxes filling electron orbitals.
Also known as: Orbital diagram arrows, Electron spin notation
Up and down arrows in boxes show electrons filling orbitals, the direction standing for spin. The arrows are a bookkeeping device for the exclusion principle and Hund's rule, not a picture of anything spinning.
Show electrons occupying orbitals, with arrow direction standing for the two possible spin states.
Contexts: Laboratory
Are a bookkeeping device for the exclusion principle and for Hund's rule rather than a depiction of rotation, which nothing at that scale does.
Contexts: Laboratory
Short vertical arrows pointing up or down, drawn singly or in pairs inside small boxes or on short lines.