Catalyst: Begin working on the handout at the front. Make sure you look up the definition of Lewis Dot Diagrams!
S ECTION 5–3: R EPRESENTATIVE G ROUPS Physical Science Coach Kelsoe Pages 139–145.
Hydrogen The hydrogen square sits atop Family I, but it is not a member of that family. Hydrogen is in a class of its own. It’s a gas at room temperature.
