CHM103 Week 5 Class Notes (9/19-9/23)
CHM103 Week 5 Class Notes (9/19-9/23) 103
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This 3 page Class Notes was uploaded by askcch on Friday September 23, 2016. The Class Notes belongs to 103 at University of Miami taught by Elliot Atlas in Fall 2016. Since its upload, it has received 12 views. For similar materials see Chemistry for Life Sciences I (Lecture) in Chemistry at University of Miami.
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Date Created: 09/23/16
CHM103 Class otes eek (9/199/23) ________________________________________________________________________________ From revious ections 2.42.8 Periodic Table, Characteristics of Different Groups, Electron Configuration ________________________________________________________________________________ Chapter 3: Ionic Compounds 3.1 ons Alkali metals (group 1A) form compounds with halogens (group 7A) Properties of these compounds include: High melting points Stable, hite, crystalline solids Soluble in water Conduct lectricity hen issolved in water * Electricity can only flow through a medium containing charged particles (ions) hat are ree o move An ion is formed when a neutral atom gains or loses electrons The loss of electron(s) gives a positively charged ion called a cation The gain of electron(s) gives a negatively charged ion called an anion Positive charge = ; Negative charge = (which n is any integer) 3.2 Ions and he ctet Rule Octet rule: Main group elements tend to undergo reactions that leave them with ight valence electrons E.g. Alkali metals with a single valence electron react with halogens with seven valence electrons, giving both ns np 6 configurations with eight valence electrons (i.e. noble gas electron configuration) E.g. N: 1s 2s 2p → N : 1s 2s 2p 6 3.3 ons of Some ommon Elements Transition metals form cations, but they can lose one or more d electrons in addition to losing alence s electrons. he octet ule is not ollowed. Metals form cations by losing one or more electrons Reactive nonmetals form anions by gaining one or more electrons to achieve noble as onfiguration Group 8A elements (noble gases) are nreactive Ionic charges of main group elements can be predicted using the group number nd the octet rule E.g. 1A = 2A X E.g. A X , 6A = A X