What we’ve learned so far: Measurement – Resolution & Significant Figures Scientific Method – Claims, Evidence, Reasoning Classifying Matter – Pure (element, compound) vs. Mixture (heterogeneous vs. homogeneous) States of Matter, Temperature, & Intermolecular Forces Density Atoms – Structure, Subatomic Particles Periodic Table – Organization Based on Electrons Next up: Chemical bonding + beyond!

W ARM UP 12/03/13 Question: How many valence electrons does Lithium have? Silicon? Sulfur? Answer: Li = 1 valence electron Si = 4 S = 6 Goal: I will learn to make Lewis dot diagrams.

ELEMENT OF THE DAY 36 – Krypton – Kr Krypton, which is non-reactive, is used in higher-end incandescent light bulbs to protect the filament. Krypton glows a bluish-white when you run electricity through it.

ELEMENT OF THE DAY 37 – Rubidium – Rb Rubidium’s name comes from the Latin word for red, even though it is a silvery metal. Rubidium has a red spectral line, hence its name, and provides a purplish color in some fireworks. Rubidium clocks, while not as accurate as cesium clocks, are much cheaper.

A GENDA - Bellwork / New & Good - What we’ve learned so far - Review Test - Electron shell activity - Video – You can’t touch anything - Homework -pg Test Corrections by Fri