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Name_______________________ Hr_____ Atom, Ion, Isotope Homework 1. What is the name of the element that has atoms that contain 25 protons. manganese 7. Write the complete chemical symbol for the ion with 84 protons, 125 neutrons, and 80 electrons. 209Po-4 2. Write the chemical symbol for the ion with 19 protons and 18 electrons (show charge). K+1 8. Write the complete chemical symbol for the ion with 27 protons, 32 neutrons, and 25 electrons. 59Co+2 3. Write the chemical symbol for the ion with 7 protons and 10 electrons (show charge). N-3 9. How many protons, neutrons, and 3+ electrons are present in the 140 58 Ce ion? P=58 N=82 e = 55 10. Write the complete chemical symbol for the ion with 73 protons, 108 neutrons, and 68 electrons. 181Ta+5 11. How many protons, neutrons, and 2electrons are present in the 45 21 Se ion? P=21 n=24 e=23 12. Write the complete chemical symbol for the ion with 31 protons, 39 neutrons, and 28 electrons. 70Ga+3 4. Write the chemical symbol for the ion with 9 protons and 10 electrons (show charge). F-1 5. Write the chemical symbol for the ion with 20 protons and 18 electrons (show charge).Ca +2 6. How many protons, neutrons, and 2+ electrons are present in the 59 28 Ni ion? P=28 n=31 e=26 13. Fill in the table. Sub-atomic Location Particle Proton Nucleus Mass (amu) Charge Role 1 +1 Identity, atomic no. Neutron Nucleus 1 0 Holds nucleus together Electron Orbiting around nucleus ~0 -1 reactivity 14. What is mass number? What particles are involved? How? Protons + neutrons 15. What is charge? What particles are involved? How? Protons - electrons 16. Calculating Average Atomic Mass Elements come in a variety of isotopes, meaning they are made up of atoms with the same atomic number but different masses. These atoms differ in the number of neutrons. The average atomic mass is the weighted average of all the isotopes of an element. Work through the guided example and then find the average atomic mass for (a) – (d) below. Show your work for credit. Guided Example: A sample of cesium has three isotopes present: cesium-132, cesium-133 and cesium134. The percent abundances are 20%, 75% and 5%, respectively. Find the average atomic mass. 1. Organize this information into a table. Percent Abundance Decimal Equivalent Isotope Mass Number 20 0.20 132 75 0.75 133 5 0.05mass of the following134 Determine the average atomic mixtures of isotopes. Show your work for Check and make sure your decimal equivalents sum to 1. If not, there is an error! each. 2. Fill in the blanks and calculate the average atomic mass: 0.20(132) + 0.75 (__133__) + _0.05____ (134) = ___132.85________ a. 80%127I, 17%126I , 3%128I .8*127 + .17*126 + .03*128 = 126.86 b. 4.35% 50Cr, 83.8% 52Cr, 9.5% 53Cr, 2.35% 54Cr 0.0435*50 + .838*52 + .095*53 + 0.0232*54 = 52.0388 c. 78.7% 24Mg, 10.13% 25Mg, d. 95% 14N, 3% 15N, 11.17% 26Mg 2% 16N 19. How many protons and neutrons are in titanium-46? P=22 n=24 p=7, n=8 Nitrogen-15? Sulfur-34?