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Published byPoppy Owen Modified over 6 years ago

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Each element on the periodic table has an isotope. What make an element have different isotopes? There are 2 different isotopes of iron Find the PEN of iron– 55 & iron– 56

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11 Atomic mass: the weighted average mass of ALL the isotopes of that element. This number is located on the bottom of each block on the periodic table Not a whole number Different from the Mass #

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A piece of carbon will contain both carbon-12 & carbon-14. Carbon-12 is found in 98% of the sample. Carbon-14 is found in 2% of the sample. What is the average atomic mass of carbon?

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Change percent to decimal Multiply the decimal by the mass # of that isotope Then add the two sums together. Answer must have units 98% =.98 2% =.02 .98 x 12 = 11.76 .02 x 14 = 0.28 11.76 + 0.28 = 12.04 12.04 amu

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1. 80% 127 I, 17% 126 I, 3% 128 I 2. 50% 197 Au, 50% 198 Au 3. 99% 1 H, 0.8% 2 H, 0.2% 3 H 4. 95% 14 N, 3% 15 N, 2% 16 N 5. Pg. 121 18 – 22

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