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**Hope you had a great weekend!**

Test on Friday – Start studying a little each night. Isotopes are atoms of the same element with different numbers of _________ which results in different _______ numbers. What are three isotopes of Hydrogen? When you’re done with the warm-up, look over the element math worksheet from last Thursday because we’re going to start class with a quiz.

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**Unit Two, Day Three Kimrey 10 September 2012**

Chemistry!! Unit Two, Day Three Kimrey 10 September 2012

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**Suppose that there were two isotopes of Sodium.**

28% of the naturally occurring sodium atoms had a mass of 22, and 72% atoms had a mass of 23. What would the average atomic weight of sodium be?

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28% = .28 72% = .72 (.28 x 22 ) + (.72 x 23 ) = 22.72 amu

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**Suppose that there were two natural isotopes of Copper.**

80% of the atoms had a mass of 63, and 20% of the atoms had a mass of 65. What would the average atomic weight of copper be?

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80% = .80 20% = .20 (.80 x 63) + (.20 x 65) = 63.4 amu

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**Suppose that a new element (E) were discovered that existed as three natural isotopes.**

25% of the atoms had a mass of 278, 38% had a mass of 281, and the remainder had a mass of 285. What would be listed as the atomic weight of this element?

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25% = .25 38% = .38 100% - (25% + 38%) 37% = .37 (.25 x 278) + (.38 x 281) + ( .37 x 285) = amu

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Average Atomic Mass The weighted average of the masses of all the naturally occurring isotopes of an element.

Average Atomic Mass The weighted average of the masses of all the naturally occurring isotopes of an element.

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