Determining an Isotope
Mass Numbers <ul><li>Atomic Mass=Protons + Neutrons </li></ul><ul><li>The identity is based on the number of protons. </li...
Protons <ul><li>Where is Iodine on the periodic table? </li></ul><ul><li>Element number 53. </li></ul><ul><li>All Iodine i...
Neutrons <ul><li>Let’s determine the number of neutrons. </li></ul><ul><li>First, Iodine 131. </li></ul><ul><li>131 is pro...
<ul><li>Iodine 130. </li></ul><ul><li>130-53=77 neutrons </li></ul><ul><li>Iodine 127 </li></ul><ul><li>127-53=74 neutrons...
Finding the number of protons <ul><li>Given a substance with a mass of 42 amu. </li></ul><ul><li>We are told this atom has...
How to solve for the identity <ul><li>The atomic number is also the same as the number of protons. </li></ul><ul><li>The a...
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Determining An Isotope

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Determining An Isotope

  1. 1. Determining an Isotope
  2. 2. Mass Numbers <ul><li>Atomic Mass=Protons + Neutrons </li></ul><ul><li>The identity is based on the number of protons. </li></ul><ul><li>Given: Iodine-131, Iodine-129, Iodine-127 </li></ul><ul><li>Let’s determine the number of neutrons. </li></ul>
  3. 3. Protons <ul><li>Where is Iodine on the periodic table? </li></ul><ul><li>Element number 53. </li></ul><ul><li>All Iodine isotopes have the same exact number of protons, 53. </li></ul><ul><li>All Iodine isotopes also have 53 electrons. </li></ul>
  4. 4. Neutrons <ul><li>Let’s determine the number of neutrons. </li></ul><ul><li>First, Iodine 131. </li></ul><ul><li>131 is protons + neutrons. </li></ul><ul><li>131-53 protons=78 neutrons. </li></ul>
  5. 5. <ul><li>Iodine 130. </li></ul><ul><li>130-53=77 neutrons </li></ul><ul><li>Iodine 127 </li></ul><ul><li>127-53=74 neutrons </li></ul>
  6. 6. Finding the number of protons <ul><li>Given a substance with a mass of 42 amu. </li></ul><ul><li>We are told this atom has 22 neutrons. </li></ul><ul><li>What is the identity? </li></ul><ul><li>Take the total mass of 42. This is 42 protons and neutrons. </li></ul><ul><li>42-22 neutrons=20 protons </li></ul>
  7. 7. How to solve for the identity <ul><li>The atomic number is also the same as the number of protons. </li></ul><ul><li>The atomic number is like a permanent address. No matter what you do to the house, it will always have the same foundation (protons) and always have the same location (atomic number). </li></ul><ul><li>20 protons=Atomic # 20, Calcium </li></ul>

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