1. Warm Up
Which frequency of visible light has the lowest amount of energy? Which has the highest?

2. Electron Config. Rules An orbital can hold 2 electrons max.
Aufbau Principle: Lower orbitals and energy levels fill up before higher ones.
Hund’s Rule: All orbitals get one electron before they get a 2nd.
Pauli Exclusion Principle: If two electrons are in the same orbital, they must have opposite spins.

3. Left Side Practice
Write the electron configurations for:
Boron (B)
Sulfur (S)
Calcium (Ca)
Nickel (Ni)
Krypton (Kr)
Silver (Ag)
Iodine (I)