What you will learn in Electron Configuration and the Blocks

1. 1. From Shells to Subshells

   Why the Bohr picture is not enough past period 2.

2. 2. The Three Filling Rules

   Aufbau, Pauli and Hund — and where each one bites.

3. 3. Blocks and Exceptions

   Reading the table as s, p, d and f — and the cases that break.