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Bellringer 9/15 1. Convert 0.62 miles into meters Conversion factor: 1km= 0.62mi Element(ary) my dear Watson • Element: a substance that cannot be broken down into simpler/other substances – Made of only 1 kind of atom – Atoms are identified based on their atomic number and mass • Atomic Number: the number of protons in an atom • Atomic Mass: the number of protons + neutrons in an atom A Typical box on the periodic table: The 3 types of Elements Important Families on the periodic table Column and name Alkali metals Alkali earth metals Characteristics Extremely soft – cut with a butter knife Most reactive metals Not found as a pure metal in nature Soft but not as soft as alkali metals Second most reactive metals Not found as a pure metal in nature but has its uses Magnesium fire starters. Alkali earth metals Alkali metals Weekly Writing: “Why is it important for you to understand the difference between the elements? When will you ever need this in real life?” 1 paragraph with 5 sentences Due: Friday 9/18 Exit Slip 9/15 1. How many metals are there? 2. How many nonmetals are there? 3. How many metalloids are there? Bellringer 9/16 1. What are 2 properties of alkali metals? 2. What are 2 properties of alkali earth metals? Important Families on the periodic table Column and name Characteristics Noble Gases NO REACTION Alkali earth metals Alkali metals Noble Gases Most reactive nonmetals Combine with alkali and alkali metals to make Salts like NaCl Used as Disinfectants Halogens Halogens Color the Periodic Table Assignment - Each element has two characteristics they can be classified as: Phase Solid, liquid, or gas Type Metal, nonmetal, or metalloid Liquids – Br and Hg Metal – Every element to the left of the stair step Gases – H, He, N, O, F, Cl, Ne, Ar, Xe, Kr, Rn Nonmetal – Everything to the right of the stair step Solids- The rest Metalloid (Semiconductors) – One square right and left of the stair step except for aluminum The properties of the elements Metals -Ductile – Can stretch or be pulled -Conductive – Heat and Electric Metalloids are in-between -Malleable – Being able to flatten and bend The most important is silicon - Lustre – Shininess Nonmetals - Dull – no luster -Brittle – Cracks, fractures, and breaks easily in solid form -Insulator – Does not allow Heat and Electric to pass Atomic Radius: distance between 2 nuclei of an element Exit Slip 9/16 1. What are the 4 properties of metals? 2. What are the 3 properties of non-metals?