2. Notes SPI 0807.9.9 Periodic Table Periodic table  A chart of all known chemical elements  Shows all the different types of atoms Purpose  To quickly locate a variety of information about a particular element How is it organized  Organized into rows called periods  Organized into columns called groups (also called families)  Arranged in numerical order by the atomic number  Also arranged other ways (metals, nonmetals, metalloids, etc) PRESS THE RIGHT-ARROW BUTTON ON YOUR KEYBOARD TO ADVANCE THROUGH THE PRESENTATION

3.  We use a chart to organize elements called…  Currently scientists believe there are only 98 naturally occurring elements in the universe (Reference link: Chemistry Website  We have also created 20 man-made elements for a total of 118 Notes The Periodic Table 118 Uuo Ununoctium SPI 0807.9.9 Periodic Table

4. SPI 0807.9.9 Periodic Table Hydrogen 1 H 1.0. Info in each square Atomic number  is the number of protons!  also matches the number of electrons! Chemical symbol Element name Atomic mass Notes

5. SPI 0807.9.9 Periodic Table Lithium 3 Li 6.941. Reminder:  The number of protons (atomic number) is the same as the number or electrons Notes How to determine the number of neutrons Two Simple Steps: 1) Round the atomic mass to the nearest whole number Example: 6.941 rounds to 7 2) Subtract the atomic number from this rounded number. Example: 7 - 3 = 4 neutrons

6. SPI 0807.9.9 Periodic Table. Write down your answers (Look back at previous slides as needed to help you) (1) What does the periodic table display? (2) What are elements? (3) What are the rows called? (4) What are the columns called? (5) Describe 2 ways the periodic table is organized. (6) How many natural elements are there? Quick Review

7. SPI 0807.9.9 Periodic Table Oxygen 8 O 16.0. Write down your answers (7) What is the atomic number and atomic mass of oxygen? (see slides 3, 6 and 7 to help you) Quick Review

8. Periodic Table in 3 Sections Another way the table is organized is into 3 sections called… Metals: (on the left & middle) Nonmetals: (on the right) Metals (on the left and middle) Metalloids: (on the zig-zag line) Nonmetals (on the right)

9. (8) Which elements are shaded above? SPI 0807.9.9 Periodic Table Review Answer the question below-write it down! (Then press the right arrow button) Answer: The metal elements are shaded above

10. (9) Which elements are shaded above? SPI 0807.9.9 Periodic Table Review Answer the question below-write it down! (Then press the right arrow button) (9) The nonmetal elements are shaded above

11. (10) Which elements are not shaded above? SPI 0807.9.9 Periodic Table Review Answer the question below-write it down! (Then press the right arrow button) (10) The metalloid elements are not shaded