Unit 1- Module 2- Electrons, Bonding and Structure

This module is all about how atoms are structured and how they bond with each other. 

Electronic Structure

Key Definition- Principal Quantum Number- A number representing the relative overall energy of each orbital, which increases with distance from the nucleus. 

Electrons have fixed energies, and orbit the nucleus in shells or energy levels. Each shell has a principal quantum number. The further away from the nucleus a shell is, the higher the principal quantum number, and also its energy. 

These shells are divided into sub-shells. Different electron shells have different numbers of sub-shells, which can be s, p, d, or f sub-shells.