2.  There are currently 118 discovered elements  They are arranged in increasing atomic number in the periodic table  The vertical columns of the table are named families/groups  The horizantal rows of the table are named periods

3.  Numbers 1-18 (or 1A-8A and 1B-10B)  Groups contain similar properties

4.  Properties change somewhat regularly across periods  The closer two elements are in a period, the more similar to each other they are

5.  These series of elements are placed below the periodic table  They fit between elements 57 and 89  They are place below the table for visual appeal

6.  The two main categories of elements are metals and nonmetals.  Metals are on the left of the periodic table  Nonmetals are on the right of the periodic table  Metalloids have properties of each and are found along the dividing line

7.  A majority of the elements  Shiny (metallic luster)  CONDUCT ELECTRICITY & HEAT  Solid at room temperature  Malleable  (able to be hammered into thin sheets)  Ductile  (able to be drawn into wire)  High tensile strength  (resist breaking when pulled)

8.  Many are gases at room temperature  Only ONE is liquid….  Bromine  Solid nonmetals are unlike metals in that…  They are brittle..NOT malleable or ductile  They are POOR heat/electricity conductors

9.  Have some characteristics similar to metals and other characteristics similar to nonmetals  ALL are solid at room temperature  Semiconductors  Certain metalloids have somewhat of a luster  Metalloids are less malleable than metals and less brittle than nonmetals

10.  Special group of nonmetals  Group 18 (8A)  UNREACTIVE (or nearly so)  All gases