1. Elements and Compounds

2. What is an Element? An element is a pure substance that cannot be broken down any farther without changing what it is All elements known to man can be found on the periodic table of elements

3. Elements Each element has specific properties that help to identify it Elements are made up of atoms – Atoms are made up of protons, neutrons and electrons An element is a pure substance and consists of only one type of atom

4. Elements Some elements you may be familiar with: – Hydrogen – Helium – Oxygen – Chlorine – Nitrogen – Sodium – Aluminum – Gold – Silver – Tin

5. What is a Compound? A compound is the combination of two or more elements bonded together You might not realize it but you are familiar with MANY compounds!

6. Compounds Compounds, unlike elements, CAN be broken down – A compound can be broken down into elements When elements combine to form a compound their properties often change – Example: Sodium (Na) as an element is different than the sodium in the compound Sodium Chloride (NaCl)

7. Compounds Below are some common compounds you might have heard of: – NaCl= Sodium Chloride= table salt! – H 2 O= Dihydrogen Oxide= water! – N 2 O= Dinitrogen Oxide= laughing gas!