Worksheet - Isotopes and Average Atomic masses 1. Name_ Period. Date Four isotopes of lead include lead-204, lead-206, lead-207, and lead-208. The average atomic mass of a lead atom is 207.2 amu. Which isotope of lead is likely to be the most abundant? 2. What do all isotopes of an element have in common? 3. Explain why carbon-14 and nitrogen-14 are not considered isotopes. 4. W r i t e the atomic symbol (symbol notation) for the two isotopes of uraniumCU), whose atomic number is 92. One isotope has 142 neutrons, and the other isotope has 146 neutrons. 5. Calculate the average atomic mass of the element iron(Fe) using the following data: Isotope % abundance Iron-54 6% Iron-56 92% Iron-57 2% 6. Calculate the average atomic mass of the element nitrogen(N) using the following data: Isotope % abundance Nitrogen-14 95% Nitrogen-15 3% Nitrogen-16 2% 7. Calculate the average atomic mass of the element lodine(I) using the following data: Isotope % abundance Iodine-127 Iodine-126 Iodine-128 80% 17% 3% 8. Calculate the average atomic mass of the element Hydrogen(H) using the following data: Isotope % abundance Hydrogen-1 99% Hydrogen-2 0.8% Hydrogen-3 0.2% 9. A certain element exists as three different isotopes, 24.1% of all the isotopes have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 22.2% have a mass of 75.20 amu. a. What is the average atomic mass of this element? b. Use your periodic table to determine which element this is. 10. An element exists as 4 different isotopes. 4.35% have a mass of 49.9461 amu, 83.79%. have a mass of 51.9405 amu, 9.50% have a mass of 52.9407 amu, and 2.36% have a mass of 53.9389 amu. a. What is the average atomic mass of this element? b. What is the identity of this element? 11. Calcium has three different isotopes. One has a mass of 35.00 amu; another has a mass of 41.00 amu; and another has a mass of 40.00 amu. Which isotope is the most abundant of the three? 12. Several isotopes of a certain atom "X" exist. 4.35% of all X atoms have a mass of 39.946 amu. 83.79% have a mass of 41.941 amu, 9.50% have a mass of 42.941 amu, and 2.36% have a mass of 43.939 amu. What is the average atomic mass of atom X? Worksheet - Isotopes and Average Atomic masses 1. Name_ Period. Date 4 Four isotopes of lead include lead-204, lead-206, lead-207, and lead-208. The average atomic mass of a lead atom is 207.2 amu. Which isotope of lead is likely to be the most abundant? 2. What do all isotopes of an element have in common? 0/1 liofo/VJ of MtkrfM-f ^ hwi H\( io^L 3. Explain why carbon-14 and nitrogen-14 are not considered isotopes. f i i r J«i^ * /-(/pe of ^ M . 4. W r i t e the atomic symbol (symbol notation) f o r the two isotopes of uranium(U), whose atomic number is 92. One isotope has 142 neutrons, and the other isotope has 146 neutrons. 5. Calculate the average atomic mass of the element iron(Fe) using the following data: Isotope % abundance Iron-54 6% Iron-56 92% Iron-57 ««. 2% . A>0 /oo /OQ 6. Calculate the average atomic mass of the element nitrogen(N) using the following data: Isotope % abundance Nitrogen-14 95% Nitrogen-15 3% . Nitrogen-16 2% /oo /oo / ^ 7. Calculate the average atomic mass of the element lodine(I) using the following data: Isotope Iodine-127 Iodine-126 Iodine-128 /oo % abundance 80% 17% 3% /oo /oo . *Vl 4 fC 16 n \N 8. J Calculate the average atomic mass of the element Hydrogen(H) using the following data: ^-s Isotope % abundance Hydrogen-1 99% Hydrogen-2 Hydrogen-3 /oo 0.8% 0.2% /oo /od 9. A certain element exists as three different isotopes, 24.1% of all the isotopes have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 22.2% have a mass of 75.20 amu. a. What is the average atomic mass of this element? O / H l f " b. Use your periodic table to determine which element this is. 0 M f T" 10. An element exists as 4 different isotopes. 4.35% have a mass of 49.9461 amu, 83.797o have a mass of 51.9405 amu, 9.50% have a mass of 52.9407 amu, and 2.36% have a mass of 53.9389 amu. a. What is the average atomic mass of this element? r \ *A ' I b. What is the identity of this element? © £) M' L Calcium has three different isotopes. One has a mass of 35.00 amu; another has a mass of 41.00 amu; and another has a mass of 40.00 amu. Which isotope is the most abundant of the three? \ 12\ Several isotopes of a certain atom "X" exist. 4.35% of all X atoms have a mass of 39.946 a i m \ j 83.79% have a mass of 41.941 amu, 9.50% have a mass of 42.941 amu, and 2.36% have a mass of 43.939 amu. What is the average atomic mass of atom X? y.saXfl.w^j >(2.m)(iw) .(jsgM^h Mto. (oo /ou> (o^ • (oo , ?(j Grtt^ Lr^ .i... ^ ^ >' \/'/ III oi n....
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