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Download Unit Test: Atomic Structure
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Test Review: Atomic Structure Test A Name: __________________________________________________________ Period: ________________ 1. Be able to describe what each of the following people contributed to understanding what atoms are. Democritus John Dalton Aristotle Robert Boyle J J Thomson Robert Millikan Neils Bohr Ernest Rutherford Antoine Lavoisier Joseph Priestly 2. Be able to define: Atom Atomic mass unit Isotope Nucleus Electron Proton Neutron Atomic Number Mass Number Average Atomic Mass Nuclear Atom 3. Be able to identify the following in a given atom: Number of protons Number of electrons -in atoms -in cations -in anions Number of neutrons in specific isotopes Mass Number Atomic Mass 4. What are the three different ways to symbolically represent an isotope of carbon? Where does the mass number appear in each? 5. Calculate mass percentages for the elements in specific compounds: A. Methane is a compound of carbon and hydrogen. A sample contains 1.2 g of carbon and 0.40 g of hydrogen. What is the mass % of hydrogen in methane? B. Benzene is another compound of carbon and hydrogen. A 78 g sample of bnzene contains 72 g of hydrogen. What is the mass % of hydrogen in benzene? 6…Hydrogen has three isotopes – H-1, H-2 and H-3. A. Which isotope has the greatest abundance? Why? B. Which of the isotopes are radioactive and which are stable? 7…Predict the most likely atomic mass for an element containing 12 protons. Why? 8. Boron has two naturally occurring isotopes: boron-10 (abundance = 19.8%) and boron-11 (abundance =__________). Calculate the atomic mass of boron. 9. What is/are? W _____________ X _______________ Y _____________ Z _____________ What is the mass number of this isotope? What model is being used to show this atom? What element is being shown? 10. Boron has two naturally occurring isotopes: boron-10 (abundance = 19.8%) and boron-11 (abundance =__________). Calculate the atomic mass of boron. 11. According to the periodic table, which of the following best represents a sodium atom?
