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CHEMISTRY TEST REVIEW Use this as a study tool to review for your CCA, October 18 th. THE PERIODIC TABLE The periodic table organizes elements in a specific order. Rows are called PERIODS and Columns are called GROUPS Elements in the same Group, have similar physical and chemical properties. Most Reactive Metals are in groups 1 & 2. Most Reactive Nonmetals are in groups 16&17. Group 18 is stable. METALS, NONMETALS, METALLOIDS METALS METALLOIDS NONMETALS are found on the LEFT side of the Periodic Table. make the stair-step dividing line. Reactivity increases moving Left - found on the RIGHT side of the Periodic Table (except for Hydrogen) Reactivity increases moving right. Noble Gases (18) are Stable. Shiny Good Conductors Ductile Malleable Semiconductors Share characteristics of metals and nonmetals. Dull Poor Conductors Brittle (Breakable) Mostly Gases USING PERIODIC TABLE to UNDERSTAND AN ATOM Each box on the periodic table tells you information about one element. Using these boxes, you will be able to determine a lot about an atom. Atomic Number will always be the whole number on top & Atomic Mass will be found on the bottom. The ATOMIC NUMBER determines the number of PROTONS and NEUTRONS! Using the ATOMIC MASS and the ATOMIC NUMBER, you can determine the number of ELECTRONS. THE ATOM Locations: Protons and Neutrons are found in the Nucleus. Electrons are found outside of the Nucleus. Finding the Number of Subatomic Parts: Use your tricks APE MAN to find the number of protons, neutrons, and electrons. A - Atomic Number M – Atomic Mass (equals) PE- (minus) Protons & A- Atomic Number Electrons N- (equals) Neutrons Using the Group Number, you can identify the number of Valence Electrons. Protons = Positive Charge Neutrons = Neutral Charge Electrons= Negative Charge Protons MUST be equal to ELECTRONS! Protons determine the element If you change the amount to Protons, you create a new element entirely. If you change the number of electrons, you create an ION. If