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Compare in detail Democritus and Aristotle’s theories on matter. What are the 3 subatomic What is the atomic number and why is particles that make up an it important? atom? What are their charges? What is an isotope? Describe the difference between a Lewis structure and a Bohr diagram. Give an example. 7. What is an ion? 10. Describe three patterns on the periodic table of elements. List the 7 scientists who contributed to modern day atomic theory and briefly state what they are know for. Describe the properties of metals, nonmetals and metalloids. How are they arrange on the periodic table? 8. How are mass number and average atomic mass similar? How are they different? 9. Compare the bonding that occurs in the first column of the Periodic table and the last column. 11. Draw the atom. Atomic # 10 Mass #21 12. Is the atom in question 11 an ion or an isotope? Explain.