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Unit 2: Matter Lesson 7: The Periodic Table ( BellWork : IN)

Unit 2: Matter Lesson 7: The Periodic Table ( BellWork : IN). Observe the Periodic Table on pgs. 154 and 155. The Periodic Table arranges elements according to increasing atomic numbers rather than atomic masses. Are there any atomic numbers out of numerical sequence? If so, which elements?

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Unit 2: Matter Lesson 7: The Periodic Table ( BellWork : IN)

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  1. Unit 2: Matter Lesson 7: The Periodic Table (BellWork: IN) Observe the Periodic Table on pgs. 154 and 155. The Periodic Table arranges elements according to increasing atomic numbers rather than atomic masses. Are there any atomic numbers out of numerical sequence? If so, which elements? Are the elements in order of increasing atomic masses?

  2. Unit 2: Matter Lesson 7: The Periodic Table(Elements) • In the 1860s, scientists realized there are at least 60 different basic classifiable elements. • Dmitri Mendeleev was the one who was able to arrange the elements on cards by increasing atomic mass and he is given credit to creating the periodic table. • Henry Moseley (1900s) then further worked on the periodic table and arranged them by increasing atomic number. This made it possible to arrange the different elements by their similar properties.

  3. Unit 2: Matter Lesson 7: The Periodic Table • The Periodic Table is a grid that informs us of each element’s atomic number, chemical symbol, chemical name, and average atomic mass. • DRAW ONE CHEMICAL SQUARE HERE AND LABEL IT! • Rows = Periods (physical and chemical properties change from one end to the other) • Columns = Groups (similar physical and chemical properties like the same number of valence electrons) • (Atomic Mass) = most stable radioactive elements/isotopes • Zigzag = metals (left) vs nonmetals (right)

  4. Unit 2: Matter Lesson 7: The Periodic Table (OUT) What did you learn about the Periodic Table that you did not know before?

  5. Activity: Make your own Periodic Table Part 1 (pgs 154-155): Part 2 (pgs 158-159): In your table answer the following: 1. Where are the most dense elements? 2. Which element is the densest? 3. Which elements are the least dense? 4. Where are the full set of valence electrons? 5. Where are the smallest set of valence electrons? 6. Where are the unreactive gases? 7. Where are the reactive gases? • Color metals, nonmetal, and metalloids • Draw in the zigzag line • Label Periods and Groups • Write down why the bottom two rows are where they are AND draw an arrow to the area on the Periodic Table where they belong.

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