Chapter 5 The Structure of Matter Section 2/3 Ionic and Covalent Bonding

Objectives Types of bonding Naming

I. What holds bonds together? A. Attraction of the valence electrons B. 8 valence electrons for stability II. Ionic bonds (attraction of charges) A. There is a transfer of electrons and the resulting opposite charges bond them B. Creates a network of atoms in a regular pattern – very strong

C. Properties 1. Melting point is >300° C 2. Conduct electricity when melted D. Usually occurs between a metal and non-metal

III. Metallic A. Occurs between two metals B. The electrons of one atom are attracted to the nucleus of another C. Electrons overlap – they can move freely and easily among atoms 1. Conduct electricity and heat very well (gold is the best conductor) 2. Flexible bonds – they slide over each other

IV. Covalent Bonds A. Usually between two non-metals B. Share electrons between two atoms C. Lower melting points - <300° C , Weaker bonds

V. Polyatomic ions A. Group of bonded atoms acting like one ion (e.g.- SO4-2) B. In a formula, consider it as one element

Ch. 4 Review/ Properties Worksheet Homework Naming Ch. 4 Review/ Properties Worksheet