Determining An Isotope
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The document discusses how to determine the number of neutrons in different isotopes of iodine. It states that iodine-131 has 53 protons and 78 neutrons, iodine-129 has 53 protons and 77 neutrons, and iodine-127 has 53 protons and 74 neutrons. It also explains how to find the number of protons and identity of an element given its mass number and number of neutrons.
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Determining An Isotope
- 2. Mass Numbers Atomic Mass=Protons + Neutrons The identity is based on the number of protons. Given: Iodine-131, Iodine-129, Iodine-127 Let’s determine the number of neutrons.
- 3. Protons Where is Iodine on the periodic table? Element number 53. All Iodine isotopes have the same exact number of protons, 53. All Iodine isotopes also have 53 electrons.
- 4. Neutrons Let’s determine the number of neutrons. First, Iodine 131. 131 is protons + neutrons. 131-53 protons=78 neutrons.
- 5. Iodine 130. 130-53=77 neutrons Iodine 127 127-53=74 neutrons
- 6. Finding the number of protons Given a substance with a mass of 42 amu. We are told this atom has 22 neutrons. What is the identity? Take the total mass of 42. This is 42 protons and neutrons. 42-22 neutrons=20 protons
- 7. How to solve for the identity The atomic number is also the same as the number of protons. 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). 20 protons=Atomic # 20, Calcium