1. How do we make larger particles than atoms?

2. SYMBOL-shorthand for one atom of an element SUBSCRIPT- Lower right corner (behind the symbol) Tells you number or atoms for that element If there is no subscript-it means one atom COEFFICIENT- In front of formula Tells you how many molecules you have All elements are multiplied by that number

3. Ba Cl 2 Ba means Barium- if no subscript you only have one There is a subscript of 2 so this means you have 2 Chlorine atoms H 2 SO 4 There is a subscript of 2 behind the H so there are 2 Hydrogen Atoms. How many atoms of Sulfur? How many atoms of Oxygen?

4. Ca 3 (PO 4 ) 2 2NaSO 4 There is a coefficient of 2 in front of the whole formula. This means all the elements in the formula are multiplied by 2 NaSO 4 + NaSO 4 When you have a subscript outside parenthesis, you multiply each element INSIDE them by that subscript

5. 2H2O2H2O 3Na 2 SO 4 4Pb(NO 3 ) 2 How many molecules? How many Hydrogens? Oxygens? How many molecules? How many Hydrogens? Sulfurs? Oxygens? How many molecules? How many Leads? Nitrogens? Oxygens?

6. MOLECULE: 2 or more atoms bonded together COMPOUND: 2 or more different atoms bonded together This happens during CHEMICAL BONDING IONIC BONDING -bonding between a ratio of metals and nonmetals COVALENT BONDING- bonding between two or more nonmetals

7. TWO TYPES TO KNOW FOR NOW: IONIC BONDING -bonding between a ratio of metals and nonmetals COVALENT BONDING- bonding between two or more nonmetals RULES FOR EACH FAMILY: Alkali Metals, Halogens, and Hydrogen make only ONE bond Alkaline Earth Metals, and Chalogens make TWO bonds Boron Group and Nitrogen Group makes THREE bonds Carbon Group makes FOUR bonds Noble gases make NO BONDS! Transition metals depends on the individual element.

8. 2H 2 O Molecules of H 2 O: 2 H (Hydrogen) :4 O(Oxygen) :2 3Na 2 SO 4 Molecules of Na 2 SO 4 3 Na (Sodium)6 S (Sulphur)3 O (Oxygen)12

9. 4Pb(NO 3 ) 2 Molecules of Pb(NO 3 ) 2 4 Pb (Lead)4 N (Nitrogen)2 O (Oxygen)6