CHEM 1A03 Chapter Notes - Chapter 9: Electronegativity, Electron Affinity, Bromine

• School: McMaster University
• Department: Chemistry
• Course: CHEM 1A03
• Professor: Linda Davis

Document Summary

Nobel gases, group 18 (8a): considered inert up until 1962 when neil bartlett made them react, all subshells are completely filled so very stable. Halogens group 7a: require 1 electron to achieve noble gas configuration, high affinity for electrons, as you go up the group, ability to oxidize increases. If you mix bromine in a solution with chlorine ions, won"t react. Bromine can"t steal electrons from chlorine because it is below in the periodic table. Trends in metals: s and p block metals (and h) tend to lose electrons. Metalloids or near-metalloids: have both metallic and non-metallic physical properties, but chemically are the same, depending on if they are bonding to metals or non-metals, they can gain or lose electrons. Amphoteric oxides: covalent bonding, form acidic solutions, basic, oxides of metalloids/near-metalloids, can react with acids or bases. Screening: repulsion between the inner and outer electrons, zeff = z s, z = full attractive charge of the nucleus.