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Lewis Model

Lewis Model. Shows only the electrons in the outermost level. Called “Valence Electrons” Valence Electrons determine how elements react . Write the symbol with 1 – 8 dots around it. F. Forming Compounds. Balance charges so they zero out. Add subscripts to make the charges balance

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Lewis Model

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  1. Lewis Model Shows only the electrons in the outermost level. • Called “Valence Electrons” • Valence Electrons determine how elements react. • Write the symbol with 1 – 8 dots around it. F

  2. Forming Compounds • Balance charges so they zero out. • Add subscripts to make the charges balance OR • Use the criss-cross method • Write the elements in the order they appear relative to each other on periodic table. Elements on left (cations) before elements on right (anions). NaClMgF Al2O3

  3. -1 +1 Cl H =HCl +2 -1 Cl Mg =MgCl2 -1 Cl

  4. -1 +1 F Na =NaF +2 -1 Cl Ca =CaCl2 -1 Cl

  5. -1 +1 Cl Na =NaCl -1 +1 Cl K =KCl -2 +1 O Na =Na2O +1 Na

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