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Name Class Date 3-10 What are isotopes? Lesson Review Write true if the statement is true. If the statement is false, change the underlined term to make the statement true. Write your answers in the spaces provided. ____________________ 1. All atoms of the same element have the same atomic mass. ____________________ 2. Two important isotopes of uranium are U-235 and U-200. ____________________ 3. Atoms of the same element that have different atomic masses are called isotopes. ____________________ 4. Three isotopes of nitrogen are protium, deuterium, and tritium. ____________________ 5. The periodic table gives the average of the atomic masses of all the isotopes of an element. ____________________ 6. The atomic number of an element never changes. ____________________ 7. An atom of hydrogen-2 has two neutrons. ____________________ 8. On the periodic table, an element’s atomic mass is not a whole number. ____________________ 9. Isotopes of an atom of an element have the same number of neutrons. ____________________ 10. All elements have two or more isotopes. Skill Challenge Skills: inferring, comparing Complete the table below with the number of each kind of atomic particle found in the isotopes. Isotope Protons Neutrons Electrons Hydrogen-1 1. 2. 3. Hydrogen-2 4. 5. 6. Hydrogen-3 7. 8. 9. Concepts and Challenges in Physical Science, Teacher’s Resources CD-ROM (c) by Pearson Education, Inc./Globe Fearon/Pearson Learning Group. All rights reserved. Elements and Atoms: CHAPTER 3, page 14 Name Class Date Isotopes Enrichment Activity for Lesson 3-10 Skills: interpreting a table, applying The table below lists isotopes of hydrogen, carbon, and oxygen. Refer to the table to answer the questions that follow. ISOTOPES OF HYDROGEN, CARBON, AND OXYGEN Element/Isotope Percentage in Nature Atomic Mass (amu) Atomic Number Mass Number Hydrogen-1 99.9985 1.007825 1 1 Hydrogen-2 0.0015 2.001410 1 2 Hydrogen-3 Trace ? 1 3 Carbon-12 98.89 12.00000 6 12 Carbon-13 1.11 13.003 6 13 Carbon-14 Trace ? 6 14 Oxygen-16 99.759 15.995 8 16 Oxygen-17 0.037 16.999 8 17 Oxygen-18 0.204 17.999 8 18 1. How many isotopes does hydrogen have? ____________________________________________________ 2. How many isotopes do carbon and oxygen have? _____________________________________________ 3. Which isotopes of the three elements are the most abundant in nature? __________________________ __________________________________________________________________________________________ 4. For which isotopes have scientists not been able to determine the atomic mass? Can you think of a reason for this? ____________________________________________________________________________ __________________________________________________________________________________________ 5. According to the table, how are isotopes named? ______________________________________________ 6. What is true about the atomic numbers for all the isotopes of carbon? For all the isotopes of hydrogen and oxygen? _____________________________________________________________________ 7. One of these isotopes has been used by scientists as a standard for the atomic mass unit (amu). Can you guess which one? Why? ________________________________________________________________ 8. Suppose you tested a sample of oxygen to determine its atomic mass. If the mass came out to be 16.112, would you conclude that the sample consisted of only one isotope? Why or why not? __________________________________________________________________________________________ __________________________________________________________________________________________ Concepts and Challenges in Physical Science, Teacher’s Resources CD-ROM (c) by Pearson Education, Inc./Globe Fearon/Pearson Learning Group. All rights reserved. Elements and Atoms: CHAPTER 3, page 15