1. CHEMICAL COMPOUNDS

2. Different ways for atoms to combine… Metal + Non-Metal – form compound made up of charged particles that become ions by gaining or losing electrons Non-Metal + Non-Metal – Nucleus of one atom forms strong attraction to valence electron of another atom – “tug of war” for electrons occurs, but neither atom wins – Instead, the two atoms share each other’s electrons, resulting in a what we call a covalent bond that holds the atoms together Metal + Metal – Alloys created by melting two or more metals and then mixing the – Different from compounds because they are solutions of metals and atoms are not chemically joined

3. IONIC COMPOUNDS (metal + non-metal) Ionic compound: a compound that consists of positively and negatively charged ions Atoms want to be stable In ionic compounds, atoms become stable by either gaining or losing electrons to accomplish a full outer shell An ionic bond is created

4. Important terms… Ion: a particle that has either a positive or a negative charge Cation: a positively charged ion Anion: a negatively charged ion

5. What would have to happen to a lithium atom in order for it to become chemically “stable”? What could it join with in order to accomplish this?

6. Bonding Between Alkali Metals and Halogens FLUORINECHLORINEBROMINEIODINE LITHIUMLiFLiClLiBrLiI SODIUMNaFNaClNaBrNaI POTASSIU M KFKClKBrKI Naming: -The name of the metal does not change -the name of the non-metal takes an “ide” ending Ex. NaCl  Sodium chloride

7. Mg v v v v v v v v Cl 2+ 1-

8. CaCl Needs to lose 2 electrons Needs to gain 1 electron CaCl 2

9. Bonding between Alkaline Earth Metals and Halogens FLUORINECHLORINEBROMINEIODINE Beryllium Magnesium Calcium BeF 2 BeCl 2 BeBr 2 BeI 2 MgF 2 MgCl 2 MgBr 2 MgI 2 CaF 2 CaCl 2 CaBr 2 CaI 2

10. HOMEWORK: Read pages 265 – 269 Questions 1-7