Modern View of Atomic Structure Notes

# Cl is found to be 7578 is 35cl has an atomic mass

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Cl is found to be 75.78% is 35Cl has an atomic mass unit wt of 34.969 amu. 24.22% of 37Cl had 36.966 amu. (%) (amu)+ (%) (amu)= wt. ave. Some have more than 2 isotopes (.7578) (34.969 amu) + (.2422) (36.966 amu) = 35.45 amu Atom loses e- => more p+ than e- positive charge cations Ions- has electrical charge Atom gains e- => more e- than p+ negative charge anions (nonmetals) Group 8A or 18 => noble gases do not form ions Main group metals form (+) charge = Group # Anions- nonmetals form (-) charge = Group #-8 how many p=, n0, e- are present in 6 Co +3

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Protons are 27 n= mass #-#p 60-27=33 Electrons= 24 Ionic Compounds- Cation(+) and Anion(-) The total charge of compound is zero NaCl 2 total (+) charges = total (-) charges Ex. NaCl + = Cl - Ex. Al +3 = Br - need 3 Br therefore AlBr 3 Al +3 O -2 Use LCD ( 2* )(3) = (2 ) (3* ) Al 2 O 3 Sn +4 O -2 (1*)(4)= (2) (2) Ionic Substance-1. Cation and Anion 2.(Metal and Nonmetal) 3.Polyatomic ions Coulomloic attraction- attractive forces b/n + and - When a formation of an ionic compound occurs a lathice occurs which is extended array of regular arranged bonds. Table 2.4 Charge Formula Name +1 La+ Na K Ca Lithium ion Sodium ion Potassium ion Cesium ion +2 Mg Ca Sr Ba Magnesium ion Calcium ion Strontium Barium
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