1. Ch.2 – Minerals and their Properties I. Elements and Compounds Pages 42-45

2. A. Atoms & Elements  Atom- smallest parts of an element that can be identified as that element  Element- simple substance that cannot be broken down  More than 100 different elements

3. A. Atomic Components  Protons- particles with an electrical charge of 1+  Neutrons- Neutral particles that do not have a charge  Electrons- particles with an electrical charge of 1-

4. A. Atoms & Elements  Can exist as solids, liquids, or gases  Most are solids at room temperature  Only 2 elements are liquid- Mercury and bromine

5. A. Common Elements ElementNatural StateElementNatural State CarbonSolidOxygenGas AluminumSolidHeliumGas SilverSolidBromineLiquid CopperSolidMercuryLiquid

6. B. Compounds  Compound- substance made up of 2 or more elements  Example- What is water made up of? Molecule- string of atoms and smallest part of a substance

7. B. Combining Elements  Compound is formed when 2 or more elements combine chemically  Each element has distinct physical and chemical properties  Are those properties shown when they combine? (salt)

8. C. Chemical Symbols  Capitals matter!  Element symbols contain ONE capital letter followed by lowercase letter(s) if necessary. Co vs. CO Metal that forms bright blue solid compounds. Poisonous gas.

9. C. Symbols of Some Elements ElementSymbol AluminumAl CalciumCa ChlorineCl GoldAu HydrogenH

10. C. Chemical Symbols  Some symbols are derived from Latin  Ex. Argentum is Latin for “silver”  Some are named after honor scientists or for their properties

11. D. Chemical Formulas  Chemical formula- shows the elements that make up a compound  Formulas tell you what is in that compound  Ex.- Salt (NaCl)

12. D. Chemical Formulas  Subscript- shows how many of each atom are in a molecule of a compound  Ex. Hydrogen peroxide?

13. E. Assignment 1. Hands-on Activity page 45 2. Complete the chemical formulas table 3. Answer questions 3-5 on same sheet of paper 4. Due: Monday