1. Periodic Table Notes

2. Protons  Protons found in nucleus of atom  Positive charge  Number of Protons determine atomic number of atom

3. Neutrons Found in nucleus of atom Neutral= Proton with an Electron smashed into it As an atom decomposes the Neutron breaks into the Proton and Electron. Protons + Neutrons =atomic weight of atom Isotopes are same element but different number of Neutrons

4. Electrons Electrons revolve around the nucleus of atom. Negative charge. Very small particles. Chemical reactions occur using electrons. In atoms electron number equal proton number.

5. Periodic Table Back cover of textbook Period- across periodic table. Tells how many shells of Electrons are present. Group- down periodic table. Groups are elements that have similar valence shells of electrons. Group 18 noble gases have all shells filled (non-reactive) Group 17 is short one electron and is very reactive. Group I has an extra electron and is also very reactive.

6. Atoms have No charge- equal number of Protons and Electrons. The smallest unit of an Element that is still that Element. Atoms have No charge- equal number of Protons and Electrons. The smallest unit of an Element that is still that Element. Ions- Charged particles. Ions- Charged particles. Cations- positive ions with more Protons than Electrons. Cations- positive ions with more Protons than Electrons. Anions- negative ions with more Electrons than Protons. Anions- negative ions with more Electrons than Protons.

7. Chemical Bonds terms Elements- Pure substances made up of only one type of atom Elements- Pure substances made up of only one type of atom Compounds- Substances made of more than one type of atom Compounds- Substances made of more than one type of atom Molecule- Substance made of more than one atom. Can be the same element. Ex. O2 or CO2 Molecule- Substance made of more than one atom. Can be the same element. Ex. O2 or CO2 Chemical bonds- inter atom connections Chemical bonds- inter atom connections Covalent Bonds- Shared electrons Covalent Bonds- Shared electrons Ionic Bonds- gain or loss of electrons Ionic Bonds- gain or loss of electrons Hydrogen Bonds- Polar attractions between atoms or molecules Hydrogen Bonds- Polar attractions between atoms or molecules