CHM 143 Lecture Notes - Lecture 5: Molar Mass, Nonmetal, Periodic Trends
15 Sep 2016
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Old= # + letter a or b (location in periodic table) *use groups and periods like coordinates on a map. Exhibits luster, thermal and electrical conductivity is malleable and ductile. Lack metallic properties, don"t conduct electricity or heat not malleable. Low temperature melting point solids, liquids or gases at room temperature. Location in the periodic table= separate metals from nonmetals. Combined with another substance will increase conductivity. Classification based on location: main group or representative elements, groups 1a-8a, transition elements, groups 1b-8b. Inner transition elements: section pulled out of table. Example na loses an electron becomes na+ Form cations because more protons than electrons. Charge is the difference between the proton and electron. How many electrons depends on group (location) 1a +1 ion (lost 1 ) 2a +2 ion (lost 2 ) 3a +3 ion (lost 3 ) *metals form ions(+) charge with magnitude of charge= group # Charge is written as superscript to the right of the symbol.
