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How many elements are presently known? How many of these elements occur naturally and how many are synthesized artificially? What are the most common...
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How many elements are presently known?What are the most common elements present on the earth?

  1. How many of these elements occur naturally and how many are synthesized artificially?
  3. Select one element from the periodic table and discuss its physical and chemical characteristics. How is the element made? What are some interesting properties and uses of the element? List the names, chemical formula, and uses at least two compounds of the element. 
  4. What is a common ion of your selected element? How do the chemical properties of the ion differ from the chemical property of the element (e.g., if you selected calcium, what is the difference in the chemical properties of a calcium ion and a calcium atom?)?

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