1. CH 2.1 The Nature of Matter

2. The basic unit of matter is the atom

3. Subatomic ParticleLocationCharge ProtonNucleusPositive (+) NeutronNucleusNeutral Electron Space around nucleus Negative (-) The difference between atoms of different elements is the number of protons & electrons they contain.

4. Atomic number Atomic mass

5. Bonds form when elements bond in chemical compounds

6. Atoms bond by transferring or sharing electrons… …in order to obtain a new form of matter

7. IonicCovalentVan der Waals One or more electrons are transferred from one atom to another Electrons are shared between atoms Slight attraction between oppositely charged regions of close-by molecules Ex: SALT (NaCl)Ex: WATER H 2 OEx: Gecko on wall TYPES OF BONDS

8. ION: an atom that has gained or lost an electron and thus has acquired a positive or negative charge

9. Molecule: structure that forms by covalent bonds (O 2, CO 2, H 2 O