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1. What does the atomic number of an element represent?

1. What does the atomic number of an element represent?. # protons. 2. What is the atomic # of iron?. 26. 3. How many protons are in an iron atom?. 26. 4. What is the charge of the nucleus of an iron atom?. +26. 5. How many electrons are in an iron atom?. 26.

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1. What does the atomic number of an element represent?

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  1. 1. What does the atomic number of an element represent? # protons

  2. 2. What is the atomic # of iron? 26

  3. 3. How many protons are in an iron atom? 26

  4. 4. What is the charge of the nucleus of an iron atom? +26

  5. 5. How many electrons are in an iron atom? 26

  6. 6. What is the net charge of an iron atom? 0

  7. 7. If you removed three electrons, what would be the net charge of the iron atom? +3

  8. 8. Write the symbol for the isotope of iron having 29 neutrons: Fe-55 55Fe 26

  9. Which has more mass – an atom of iron or an atom of carbon? How do you know? An atom of iron. Iron has a higher atomic mass than carbon.

  10. Draw a model for an atom of carbon-12

  11. What are the three major physical states of matter? Solid Liquid Gas

  12. When liquid water evaporates it becomes a gas. The volume increases as gas molecules move farther apart.A. If volume increases due to evaporation, what happens to the density of the water? It decreases (D = M/V)

  13. B. Explain why clouds form over warm ocean waters: Water evaporates as it is heated. It has a lower density (a gas), so it rises. Once it cools to its dew point the vapor condenses to form cloud droplets.

  14. Is tapwater a substance or a mixture? Explain. Mixture. It consists of water mixed with various salts.

  15. Is water a substance or a mixture? Depends. If distilled and degasses it is a substance. Otherwise it is a mixture.

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