The Periodic Table -The periodic table contains all of the known elements that have been discovered so far. Elements: Are pure substances that cannot be broken down into simpler forms. How Is it Organized? -Metals are found on the left side of the PT. Properties of metals include a high lustre (shiny), malleable (can shape them), soft and are usually solid at room temp. - The staircase is the region of the periodic table that divides the metals from the non- metals. - Non-metals are found on the right side of the PT. Properties of non-metals include a low lustre, non-malleable, brittle and are usually gas at room temp. - The table is organized into rows, called periods which go from leftright. There are 7. - The table also has columns, called groups which go from topbottom. There are 18. Information on the Table 8 -219C O 15.994 -183C Chemical Families and a Chemical “Staircase” -Elements that are in the same group generally have similar physical and chemical properties. These elements with similar properties are called chemical families. Alkali Metals: Group #1 (except hydrogen), these are highly reactive metals. Alkali Earth Metals: Group #2, these are fairly reactive metals. Transition Metals: Group #3-12, these are metals that gradually become more non-metal like as you move to the right. Metalloids: These are elements that touch the staircase, they have properties of both metals and non-metals. Halogens: Group #17, these are highly reactive non-metals. Noble Gasses: Group #18, these are unreactive non-metals.
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