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Unit 3 Exam Famous scientists Periodic table arrangement Periodic Trends Atomic structure Calculations: light and atomic mass
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1. Which scientist is credited with discovering the nucleus?
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2. The existence of _________ disproved Dalton’s theory that all atoms of an element were identical.
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3. Which scientist studied experiments with light to describe the orbits (or energy levels) where electrons exist?
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4. Which scientist proved the existence of negatively charged subatomic particles?
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5. What element is in group 16 of period 4?
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6. What halogen is located in period 2?
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7. What element has 5 valence electrons in the 2 nd energy level?
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8. A group on the periodic table contains the most reactive metals. How many valence electrons do these elements have?
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9. Which of the following elements would have properties similar to calcium and why? aluminumpotassium sulfurstrontium
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Set up your paper like this # protons# neutrons# electrons For the following atoms or ions, give the numbers of protons, neutrons, and electrons.
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10. a neutral atom of helium with a mass number of 4
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11. sodium-23
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12. a rubidium-85 ion with a +1 charge
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12. aluminum-27
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13. carbon-14
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14. a -3 anion of nitrogen-14
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15. 9 Be 2+ 4
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Periodic Trends Find these elements on the periodic and compare their location to answer the questions.
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16. Which of the following elements would have the largest atomic radius? LiNaRbCs
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17. Which of the following elements would have the smallest atomic radius? Mg SiAlCl
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18. Which of the following elements would have the lowest ionization energy? LiBeBO
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19. Which of the following elements would have the highest ionization energy? IClFBr
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20. ___________ is the tendency of an element to attract shared electrons.
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21. Which of the following elements has the lowest electronegativity? CsKLiNa
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22. Which of these elements would make a bond with nitrogen? (similar to P bonding with B) AlMgBaC
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23. Which of these elements would make a bond with chlorine? (similar to K bonding with Br) OFLiXe
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Get a calculator so we can practice some of the math problems that will be on the test
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24. What is the frequency of light with a wavelength of 5.60 x 10 -7 m?
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25. Calculate the energy of a photon with a frequency of 7.35 E 8 Hz
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26. The % abundance and atomic mass of isotopes of element Z are given in the table. Calculate the average atomic mass of the element. Isotope% abundanceAtomic mass (amu) 35 Z75.53%34.969 37 Z24.47%36.966
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