1. More About The Periodic Table In your science notebook, copy all Stop to Think questions and Analysis questions. Provide a complete answer for each. You will have 2 class periods to complete this lesson.

2. In this lesson you will need the copy of the periodic table handout you were given earlier. As you go through the lesson, be sure to label the location of each of the following: Metals Nonmetals Metalloids Noble Gases Halogens Transition Metals Reactive Metals Radioactive Elements

3. Key Vocabulary Reactive Metal Nonmetal Metalloid Isotopes Radioactivity Half-life

4. Reactive Metals Transition Metals Rare Earth Metals Metalloids Halogens Noble Gases In your science notebook, make a copy of the table below. As you read through the lesson, make notes about each of the following. Consider how each is used, provide examples, and any other information you feel is note worthy

6. Stop to Think

13. Explain why the Lanthanum elements are considered Rare Earth Metals

17. Stop to Think

20. What is an Isotope? An isotope is one particular form an atom that an element might take. Just as people may be thin, medium weight, or heavy, isotopes vary according to their weight. You will remember from the last chapter that the mass of an atom is determined by adding the number of protons to the number of neutrons in the nucleus. Since all the atoms of an element must have the same number of protons, the only thing that can vary to cause this change is the number of neutrons. Put simply: Isotopes are atoms with the same number of protons, but differing numbers of neutrons. Isotopes are different forms of a single element. Examples: Carbon 12 and Carbon 14 are both isotopes of carbon, one with 6 neutrons and one with 8 neutrons (both with 6 protons ). Click the link below and closely listen to how the scientist explains the definition of an isotope and how isotopes change the weight of an element, but do not affect the other properties of an element. What is an Isotope?

22. Stop to Think

23. Click the link below to better understand how radioactive decay is used in science, especially in determine how old something is: Radioactive Decay

25. Analysis Copy each of the following question and provide a complete answer.