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Ionic bonding, Lewis Dot Diagrams

Ionic bonding, Lewis Dot Diagrams. Gilbert Newton Lewis (surrounded by pairs of electrons). Please work ahead if you finish a section before the rest of the class. Lewis diagrams (Q1, Q2). Lewis suggested a means of keeping track of outer (or valence) electrons

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Ionic bonding, Lewis Dot Diagrams

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  1. Ionic bonding, Lewis Dot Diagrams Gilbert Newton Lewis (surrounded by pairs of electrons)

  2. Please work ahead if you finish a section before the rest of the class.

  3. Lewis diagrams (Q1, Q2) • Lewis suggested a means of keeping track of outer (or valence) electrons • Read handout up to “The Octet Rule”. Do Question 1 and Question 2 Q1 Ne Sb Rb F Q2 P P P P

  4. Ions and the octet rule (Q3) Br P Ne Al Ca Read the remainder of the handout. Do Q3. Ar (3) Ne (0) Ne (3) Ar (2) Noble gas Kr (spaces) (1) – Br Ion P 3– none Al 3+ Ca 2+

  5. Overview: Types of Bonds (Q4) • There are 2 bond types : ionic and covalent • In ionic bonding one atom has a stronger attraction for electrons than the other, and “steals” an electron from a second atom • In covalent bonding the attraction for electrons is similar for two atoms. They share their electrons to obtain an octet. • Read “types of bonds” on handout. Do Q4. • MgO (ionic), CaCl2 (ionic), SO2 (covalent), PbCl2 (ionic), CCl4 (covalent), CH4 (covalent)

  6. e– 1) 2) Na Na+ Cl Cl– Cl– Na+ Ionic bonding • Ionic bonding involves 3 steps (3 energies) • 1) loss of an electron(s) by one element, 2) gain of electron(s) by a second element, 3) attraction between positive and negative 3)

  7. 1e- 3p+ 3p+ 17p+ 2e- 2e-1e- 7e- 8e- 2e- 17p+ 8e-8e-2e 4n0 18n0 4n0 18n0 Cl [Li]+ [ Cl ]– Li Ionic bonding (Q5 - Li + Cl) • Ionic bonding (stealing/transfer of electrons) can be represented in three different ways • Read the remainder of handout. Do Q5. Li + Cl  [Li]+[Cl]–

  8. 8p+ 8p+ 8e- 2e- 6e- 2e- 8n0 8n0 1e- 12p+ 12p+ 2e- 8e- 2e- 8e- 2e- 12n0 12n0 1e- O [Mg]2+ [ O ]2– Mg Ionic bonding: Mg + O Mg + O  [Mg]2+[O]2– For more lessons, visit www.chalkbored.com

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