CHEM101 Lecture Notes - Lecture 12: Electron Affinity, Valence Electron, Covalent Bond

• School: University of Alberta
• Department: Chemistry
• Course: CHEM101
• Professor: Yoram Apelblat

Document Summary

Oxidation number: a few examples: hno3, cr2o7. 2na (s) + h2o (l) oxidizing reduced (cid:198) 2na+ + oh + h2: as we go down the group, do alkali metals become better or worse reducing agents? they become better reducing agents. Predicting redox behaviour: properties of good oxidizing agents. How does the reactivity change down the group: properties of good reducing agents. Are alkali metals good oxidizing or reducing agents? reducing: the space shuttle booster rockets employ this reaction identify the oxidizing and reducing agents: Metals vs. non-metals: what are the differences: metals left/lower left of the periodic table, non-metals upper right of the periodic table, metalloids (green) intermediate properties. Metals are typically shiny solids with moderate to high melting points. Metals are good conductors of heat and electricity, and can easily be shaped. Metals tend to lose electrons and form cations, i. e. , they are easily oxidized. Most metals form ionic oxides, which are basic in aqueous solution.