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ANSWERS to HOMEWORK 1.3.3 Questions (page 64)

ANSWERS to HOMEWORK 1.3.3 Questions (page 64). Check-in: Carbon has 3 isotopes, with masses of 12, 13 and 14. Which isotope is the most abundant? How do you know?. Carbon 12—it’s closest to the average atomic mass on the periodic table (12.011).

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ANSWERS to HOMEWORK 1.3.3 Questions (page 64)

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  1. ANSWERS to HOMEWORK 1.3.3 Questions (page 64)

  2. Check-in: Carbon has 3 isotopes, with masses of 12, 13 and 14. Which isotope is the most abundant? How do you know? Carbon 12—it’s closest to the average atomic mass on the periodic table (12.011)

  3. 1. Explain the different between atomic number and atomic mass. Atomic number is = to the number of protons while the atomic mass is an average mass of all atoms of that element including isotopes.

  4. 2. Explain the different between the average atomic mass given on the periodic table, and the mass number of an atom. Mass number is the number of protons + neutrons for a single atom while the average atomic mass includes all isotopes of a given element.

  5. There are 3 isotopes of potassium, potassium-39, potassium-40, and potassium-41. a. What do these isotopes have in common? What makes these isotopes different from each other? Write the isotope symbols for each of these three isotopes. They all have 19 protons They have different numbers of neutrons 39 40 41 K K K 19 19 19

  6. How many protons, neutrons, and electrons are in each of the following atoms? a. Fluorine-23 b. Co c. Zinc-70 59 27 Protons: 9 Neutrons: 14 Electrons: 9 Protons: 27 Neutrons: 32 Electrons: 27 Protons: 30 Neutrons: 40 Electrons: 30

  7. An isotope of iron has 26 protons and 32 neutrons. What is the mass of this isotope? Write the symbol for this isotope. 58 58 Fe 26

  8. Find the element phosphorus on the periodic table. a. What is the average atomic mass of phosphorus? What is its atomic number? Predict which isotope of phosphorus is the most common. Explain. 30.97 15 Phosphorus-31 (closest to the average atomic mass)

  9. 7. Chlorine, Cl, is 76% chlorine-35 and 24% chlorine-37. Determine the average atomic mass of chlorine. (35 x .76) + (37 x .24) = 35.48

  10. 8. Lithium, Li, is 7.6% lithium-6 and 92.4% lithium-7. Determine the average atomic mass of lithium. (6 x .076) + (7 x .924) = 6.924

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