CHEM 110 Lecture 7: Chapter 07
1 Oct 2017
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Document Summary
All the alkali metal elements will tend to lose 1 electron to form a +1 cation that has the same electron configuration as the preceding noble gas element. All alkaline earth metal elements tend to lose 2 electrons to form +2 cations with the same electron configuration as the preceding noble gas element. All halogen elements tend to gain 1 electron to form a 1 anion, with the same electron configuration as the next noble gas element. Hydrogen is happy with two electrons to fill the 1s subshell. Atoms will form ions by taking the shortest route to a noble gas electron configuration (ie to get 8 valence electrons, a filled shell, 2 valence electrons in the case of hydrogen) Shortest route is to gain 2 electrons and become a 2- anion: electrons are lost from the valence shell. Contains the simplest set of subscripts; ratio of cations to anions.
