1. Page 133 Wednesday, April 1, 2015 Thursday, April 2, 2015 Page 134 Wednesday, April 1, 2015 Thursday, April 2, 2015 Homework: Get Caught Up on any missed science assignments Periodic Table Basics Warm Up: You need a Periodic Table 1.Name five elements that have a one letter symbol and that is also the first letter of the word. 2.Name five elements that have a two letter symbol and that is also the first two letters of the word. 3.Name one element named after a person. 4.Name one element named after a planet. 5.Name one element named after a city, state, country, or a university. Periodic Table Basics Check for Understanding Copy the question and write the correct answer.

2. Check for Understanding: Which of the following is the heaviest a.The electron b.The proton c.The neutron d.The nucleus Neutral lithium has 3 protons. During a chemical reaction, 1 electron is removed. How many protons does lithium have now? a.3 b.2 c.1 d.0 The nucleus of an atom is a.Always positive b.Always negatively charged c.Always neutrally charged d.Sometimes empty

3. Dmitri Mendeleev 1834 - 1907 In 1869, he published a table of the elements organized by increasing atomic mass and patterns in chemical properties.

4. Dmitri Mendeleev 1834 - 1907 In 1869, he published a table of the elements organized by increasing atomic mass and patterns in chemical properties. Literacy – summarize the article “Periodic Table of the Elements ”

5. Mendeleev’s Original Periodic Table

6. However, in spite of Mendeleev’s great achievement, problems arose when new elements were discovered and more accurate atomic weights determined. By looking at our modern periodic table, can you identify what problems might have caused chemists a headache? Ar and K Co and Ni Te and I Th and Pa

7. Henry Moseley 1887 - 1915 In 1913, through his work with X-rays, he determined the actual nuclear charge (atomic number) of the elements*. He rearranged the elements in order of increasing atomic number.

8. Group or Family Similar chemical properties Period Atoms increase in size from left to right Metalloids Non-Metals Metals Periodic Table Geography You will need : three colored pencils and handout

9. Alkali Metals Family This family is the most reactive family of elements Noble Gas This family is the least reactive family of elements PBS Hunting the Elements Video on You Tube