Chapter_09_Part1_S1-S20

Chapter_09_Part1_S1-S20 - 6/18/2010 1 Tro, Chemistry: A...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 6/18/2010 1 Tro, Chemistry: A Molecular Approach 1 Chapter 9 Chemical Bonding I: Lewis Theory 9.2 Types of Chemical Bonds • Ionic Bonding c Transfer electrons fully from the metal (low IE) to the nonmetal(high EA) c Stabilized by the electrostatic energy of attraction between the oppositely charged ions Attraction is greater with greater 1 2 q q 1 E 4 r πε = PDF Created with deskPDF PDF Writer - Trial :: http://www.docudesk.com 6/18/2010 2 • Covalent Bonding c electrons are between atoms c lowest energy position is between the nuclei c shared electrons hold the nuclei together in molecules c molecules form if the atoms can reach a lower energy state by sharing their electrons • Metallic Bonding c valence electrons are shared between all the metal atoms 9.3 Representing Valence Electrons with Dots Sulfur → S Group 6A 6 valence electrons so 6 dots • The “S” represents the nucleus and the • • • • • • S PDF Created with deskPDF PDF Writer - Trial :: http://www.docudesk.com 6/18/2010 3 Lewis Electron Dot Structures Represent the valence electrons as dots number of dots = Form compounds by exchanging or sharing electrons to reach the lowest energy, usually 9.4 Ionic bonding: Lewis Structures and Lattice Structures 2Na• + → 2Na + + Na 1s 2 2s 2 2p 6 3s 1 Na + 1s 2 2s 2 2p 6 configuration of S 1s 2 2s 2 2p 6 3s 2 3p 4 S 2- 1s 2 2s 2 2p 6 3s 2 3p 6 configuration of • • • • • • S • • •- • • • • • 2 S A. Ionic bonding and Electron Transfer PDF Created with deskPDF PDF Writer - Trial :: http://www.docudesk.com 6/18/2010 4 7 B. Lattice Energy: The Rest of the Story • the ionization energy of the metal is c Na( s ) → Na + ( g ) + 1 e ─ ∆ H° = +603 kJ/mol • the electron affinity of the nonmetal is c ½Cl 2 ( g ) + 1 e ─ → Cl ─ ( g ) ∆ H° = ─ 227 kJ/mol • generally, the ionization energy of the metal is larger than the electron affinity of the nonmetal, therefore the formation of the...
View Full Document

This note was uploaded on 11/01/2010 for the course CHEM 12412 taught by Professor Af during the Summer '10 term at CSU Long Beach.

Page1 / 10

Chapter_09_Part1_S1-S20 - 6/18/2010 1 Tro, Chemistry: A...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online