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Today we are going to be talking about isotopes.
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Isotopes are the same element that have a different mass number.
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This is because the number of neutrons in the element changes.
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Okay.
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So a general way to write out isotopes is to have x be the element.
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And the superscript above the x.
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Represents the mass number.
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This will be the number that changes as the number of neutrons in your element change.
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The atomic number is equal to the number of protons.
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For example, we are talking about barium.
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Barium has 56 protons.
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So let's look at two different examples of barium isotopes.
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We're going to look at 70s.
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84 neutrons versus 81 neutrons.
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Okay, so for both of these, we know that our element is barium...