Gilbert Newton Lewis (surrounded by pairs of electrons)

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Hybrid orbitals, Lewis diagrams, the octet rule

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Presentation transcript:

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 Read handout up to The Octet Rule. Do Question 1 and Question 2 NeSbRbF PPPP Q1 Q2

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

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),CaCl 2 (ionic),SO 2 (covalent), PbCl 2 (ionic),CCl 4 (covalent),CH 4 (covalent)

Cl – Na + Cl – 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 Na Cl e–e– 1) 2) 3) Na +

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] – 3p + 4n 0 2e - 1e - 17p + 18n 0 7e - 8e - 2e - 1e - 3p + 4n 0 2e - 17p + 18n 0 8e - 8e - 2e Li Cl [ Cl ] – [Li] +

Ionic bonding: Mg + O Mg + O [Mg] 2+ [O] 2– 12p + 12n 0 2e - 8e - 2e - 1e - [ O ] 2– [Mg] 2+ 6e - 2e - 8n 0 8p + 1e - 8e - 2e - 8n 0 8p + 12p + 12n 0 2e - 8e - O Mg For more lessons, visit