Unit 1 Section B: Counting Subatomic Particles Worksheet 1. boron

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Unit 1 Section B: Counting Subatomic Particles Worksheet Using a periodic table, fill in the chart with the correct information. Assume that all atoms are electrically neutral. Name Symbol Atomic Number M ass Number # of Protons # of Neutrons # of Electrons 1. 2. boron zinc B 5 11 5 6 31 5 3. 4. 5. 6. 7. 8. fermium 9. 10. cesium K U 22 42 42 122 257 97 47 27 146 60 79 51 55 11. 12. krypton 13. 14. N 86 120 222 15 78 47 15. 7 7 1. What similarities exist between the answers to questions 14 and 15 on the table? ______________________________________________________________________________ ______________________________________________________________________________ 2. What differences exist between the answers to questions 14 and 15 on the table? ______________________________________________________________________________ ______________________________________________________________________________ 3. What term can be applied to atoms like those described in questions 14 and 15 on the table? ______________________________________________________________________________ ______________________________________________________________________________ 4. What is the difference between mass number (used in this exercise) and atomic weight (found on the periodic table)? _____________________________________________________________________________________ _______________________________________________________________________

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