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  1. 1. Bring Your “Matter and Energy” Book!! We will do questions from the book, so you will need it!!
  2. 2. Isotopes Foundation Science 4 Class Code SC22102
  3. 3. Isotopes Isotopes of an element have the same number of protons, but different numbers of neutrons. So, helium (He) has 2 protons. Isotopes of Helium all have 2 protons and 4 or 6 neutrons.
  4. 4. Isotopes
  5. 5. Isotopes with more neutrons are heavier
  6. 6. How is the Atomic Weight Calculated? The isotope percentages of a naturally occurring element are averaged Isotopes are why the atomic weight numbers have decimals Atomic weight is simply the mass of the element in nature (isotope % included)
  7. 7. If you look in the periodic table you will be able to check that our answer is correct! Calculate Atomic Weight The natural abundance for boron isotopes is: 19.9% 10B (10.013 amu) and 80.1% 11B (11.009amu). What is the atomic weight of boron. If you look at boron (B) on the periodic table in your dynamic earth book, you can check that your answer is correct! Keep trying until you get the right Example from carbon to help you…..