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Atoms and Isotopes - Study Guide Quest on Tuesday! Study Sources: notes, guided notes, worksheets, HW, video clips and web sites Define the following terms: atom proton atomic number isotope Dalton Democritus electron cloud subatomic particle nucleus neutron mass number nucleon Thomson Bohr cathode ray average atomic mass orbital electron atomic mass atomic mass unit (amu) Rutherford scanning tunneling microscope simple atomic model Chadwick calculator ~ calculator ~ calculator ~ calculator ~ calculator ~ calculator ~ calculator ~ calculator ~ calculator ~ calculator ~ calculator Reply to these questions related to the main ideas of the unit: Describe Democritus’ ideas about atoms Explain Dalton’s theory Identify special instruments used to view atoms Describe and sketch three types of subatomic particles and their locations in the atom Describe the structure of atoms according to Rutherford’s atomic model Identify inadequacies in Rutherford’s models Explain Thomson’s experiment which led to the discovery of electrons Recognize the new proposal in the Bohr model of the atom Calculate the number of subatomic particles in a neutral atom Calculate the mass number and average atomic mass Explain what makes elements and isotopes different from each other and the same Construct and understand chemical (shorthand) notation for isotopes of elements Solve: 1. For the element barium (Ba), give the atomic #, mass #, #protons, #neutrons, #electrons, and the average atomic mass 2. Calculate the average atomic mass of chlorine with two isotopes. Cl-35 has a mass of 34.969 amu with an abundance of 75.53%, while Cl-37 has a mass of 36.966 amu at 24.47% 3. Sketch a simple atomic model of the oxygen atom. Include all subatomic particles. Label the parts. 4. Which subatomic particle was discovered by Rutherford? 5. Of these isotopes of silicon, which one is most abundant? Explain why. Si-28, Si-29, Si-30 6. Write the element aluminum in chemical notation Complete/review all HW and worksheets to support your preparation. Revisit the websites we explored (Brainpop – Isotopes), or check out some new ones…. Youtube: How to Calculate Atomic Mass Practice Problems https://www.youtube.com/watch?v=ULRsJYhQmlo Youtube tutorial/lesson: What is an isotope? http://www.youtube.com/watch?v=6w7raarHNA8&NR=1