Bellwork Thursday On your way in, you should have received a card with an ion on it. Using your card, do the following… Find a person or people who balance out the charge on your card and stand by them. Write the compound you form with your group. Name the compound. Is your compound ionic or molecular? How do you know?

Ga S Br +3 C -4 Write out the Lewis dot structures for the following: Bellwork Monday Write out the Lewis dot structures for the following: Ga S Br +3 C -4

Unit 11 Ch 7 & 8 Part 2 Ionic Bonding Continued Metallic Bonding

7.2 Ionic Bonds Ionic Bond - A chemical bond formed by the electrostatic attraction between a cation and an anion when there is a transfer of electrons. Ionic compounds are generally a metal and a nonmetal bonded together.

Example: When potassium reacts with chlorine what kind of compound is formed? Ionic Is there a transfer of electrons? Yes Using the Lewis structures show what happens to K and Cl when they combine to form salt.

Properties of Ionic Compounds High melting points Solids at room temperature Crystalline in structure, referred to as a crystal lattice MP: 802°C

7.3 Bonding in Metals Metallic bonds – consist of the attraction of free-floating valence electrons for the positively charged metal ions. These forces hold metals together Free Floating valence e- Positively charged metal ion

Properties of Metallic Compounds: Good conductors Ductile – can be drawn into a wire Malleable – can be hammered into sheets or forced into shapes

Crystalline Structure of Metals Metals and ionic compounds are in compact orderly patterns Identically sized spheres have several arrangements Simple cubic Body-centered cubic Face-centered cubic

Simple Body-centered Face- centered

Bonding in Metals Alloys – mixtures of two of more elements, at least two of which are metals. Steels are the most important alloys today Consist of Fe, C, B, Cr, Mn, Mo, Ni, W, V Ex: Brass, steel, 14 K gold, sterling silver, & cast iron

Ex #4 Cation Anion Write the compound here. What is the name of the compound? Is the compound ionic or covalent?