Electron Arrangements Page 2

Electron Arrangements

• Aufbau principle – the principle that states that electrons fill available orbitals with the least energy first

• Highest energy electrons of a neutral atom will be found in the sublevel indicated by the period and the block of the

periodic table containing the element

• Pauli exclusion principle – the principle that states that each orbital can hold a maximum of two electrons

• Electrons have opposite spins when in same orbital

• Hund’s rule – the rule that states that when filling equal energy orbitals, electrons fill each orbital singly before filling

orbitals with another electron already in them

• Ex)

Chemistry 3.4 – Electron Arrangements

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