Lecture 4.3- Isotopes

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Section 4.3 Lecture for Honors & Prep Chemistry

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  • Neon-20, neon-21, and neon-22 are three isotopes of neon, a gaseous element used in lighted signs. Comparing and Contrasting How are these isotopes different? How are they similar?
  • Au is the chemical symbol for gold. Applying Concepts How many electrons does a gold atom have?
  • ANS:CPTS:1REF:p. 112OBJ:4.3.1
  • ANS:CPTS:1REF:p. 111OBJ:4.3.2
  • Lecture 4.3- Isotopes

    1. 1. 10/2- Bellwork Fill in the chart Subatomic Location Charge Mass particle (in or out of nucleus) Proton Neutron Electron
    2. 2. Elements are different because they contain different numbers of protons. The atomic number of an element is the number of protons in the nucleus.
    3. 3. For neutral atoms PROTONS = ELECTRONS
    4. 4. ISOTOPES-Atoms with the same number of protons, but different numbers of neutrons
    5. 5. ISOTOPES-Atoms with the same number of protons, but different numbers of neutrons They are still the same element, but they have different weights because they have different numbers of neutrons.
    6. 6. The number of protons plus neutrons in an atom is called the mass number.
    7. 7. The number of protons plus neutrons in an atom is called the mass number. Isotopes are identified by their mass numbers. Mass number Iodine-131 or 131 53 I atomic number
    8. 8. Isotopes of an element will have the same _____________ but different ____________.
    9. 9. Isotopes of an element will have the same _____________ but different ____________. atomic number
    10. 10. Isotopes of an element will have the same _____________ but different ____________. atomic number mass numbers
    11. 11. Isotopes are chemically alike because they have identical numbers of protons and electrons.
    12. 12. Au is the chemical symbol for gold.
    13. 13. Au is the chemical symbol for gold. protons + neutrons
    14. 14. Au is the chemical symbol for gold. protons + neutrons protons
    15. 15. Au is the chemical symbol for gold. protons + neutrons protons
    16. 16. Au is the chemical symbol for gold. protons + neutrons 118 protons
    17. 17. Au is the chemical symbol for gold. protons + neutrons 118 protons neutrons
    18. 18. 4.1
    19. 19. for Sample Problem 4.1
    20. 20. for Conceptual Problem 4.2
    21. 21. The atomic mass of an element is a weighted average, which accounts for how much of each isotope occurs naturally.
    22. 22. The atomic mass of an element is a weighted average, which accounts for how much of each isotope occurs naturally.
    23. 23. 4.3 Some Elements and Their Isotopes
    24. 24. for Conceptual Problem 4.3 for Conceptual Problem 4.3
    25. 25. The periodic table arranges elements into groups based on a set of repeating properties.
    26. 26. •Each horizontal row of the periodic table is called a period. • Within a given period, the properties of the elements vary as you move across it from element to element. • At the end of a sentence, written horizontally, is a period.
    27. 27. 4.3 The Periodic Table—A Preview A Period
    28. 28. 4.3 The Periodic Table—A Preview A Period
    29. 29. •Each vertical column of the periodic table is called a group, or family.
    30. 30. •Each vertical column of the periodic table is called a group, or family. •Elements within a group have similar chemical and physical properties.
    31. 31. 4.3 The Periodic Table—A Preview A Group or Family
    32. 32. 4.3 The Periodic Table—A Preview A Group or Family
    33. 33. 4.3 Section Quiz 1. Isotopes of an element have a. the same mass number. b. different atomic numbers. c. the same number of protons but different numbers of neutrons. d. the same number of protons but different numbers of electrons.
    34. 34. 4.3 Section Quiz 1. Isotopes of an element have a. the same mass number. b. different atomic numbers. c. the same number of protons but different numbers of neutrons. d. the same number of protons but different numbers of electrons.
    35. 35. 4.3 Section Quiz 2. How many neutrons are in sulfur-33? a. 16 neutrons b. 33 neutrons c. 17 neutrons d. 32.06 neutrons
    36. 36. 4.3 Section Quiz 2. How many neutrons are in sulfur-33? a. 16 neutrons b. 33 neutrons c. 17 neutrons d. 32.06 neutrons

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