CDO CP Chemistry Unit 5
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1 1. Of the three particles; protons, neutrons, and electrons, which one(s) are responsible for most of the mass of an atom? a) the protons only b) the electrons only c) the neutrons only d) the protons and neutrons e) the protons and electrons Questions 2-4 refer to the following terms. Each answer may be used once, more than once, or not at all. a) proton b) electron c) neutron d) proton & neutron 2. Has a mass of 1 amu. 3. Has a charge of Defines the volume of the atom. 5. The modern periodic table has the elements arranged in order of increasing a) electron energy b) atomic number c) atomic size d)molar mass Questions 6-9 refer to an isotope with a mass number of 31, 16 protons, and a charge of The atomic number is. a) 14 b) 15 c) 16 d) The isotope contains electrons. a) 14 b) 15 c) 16 d) The nucleus contains neutrons. a) 14 b) 15 c) 16 d) The element is. a) Si b) P c) S d) Ar 10. Which of the following were not part of Dalton s atomic theory? a) Atoms are the basic building blocks of nature. b) Atoms are composed of electrons, neutrons, and protons. c) Atoms are reshuffled in chemical reactions. d) The atoms of an element are identical. e) Different isotopes can exist for the same element. 11. Explain each of the following scientists contribution to the atomic theory. (a) John Dalton (b) JJ Thomson (c) Ernest Rutherford (d) R.A. Millikan
2 12. Write the symbol, mass number, atomic number, and electrical charge of the element given the following information. Refer to the table of the elements. (a) An ion of Sr contains 36 electrons and 52 neutrons. (b) An ion contains 24 protons, 28 neutrons, and 21 electrons. (c) An ion contains 36 electrons and 45 neutrons and has a -2 charge. (d) An ion of nitrogen contains 7 neutrons and 10 electrons. (e) An ion contains 54 electrons and 139 nucleons and has a +3 charge. 13. A given element is composed of 57.5% of an isotope with an isotopic mass of amu and the remainder an isotope with an isotopic mass of amu. What is the atomic mass of the element? What is the element? 14. Using the periodic table, complete the following table for isotopes or ions. Isotope Isotopic Notation Atomic Number Mass Number Protons Neutrons Electrons Cu K + F
3 15. Electromagnetic radiation travels through vacuum at a speed of m/s. a. 186,000 b. 125 c. 3.0 x 10 8 d. 10,000 e. It depends on wavelength. 16. The wavelength of light that has a frequency of a b x 10-5 c d e s is m. 17. The energy of a photon of light is proportional to its frequency and proportional to its wavelength. a. directly, directly b. inversely, inversely c. inversely, directly d. directly, inversely e. indirectly, not 18. Of the following, radiation has the shortest wavelength. a. X-ray b. radio c. microwave d. ultraviolet e. infrared f. 19. Of the following, radiation has the longest wavelength and radiation has the greatest energy. gamma ultraviolet visible a. ultraviolet, gamma b. visible, ultraviolet c. gamma, gamma d. visible, gamma e. gamma, visible
4 20. What color of visible light has the longest wavelength? a. blue b. violet c. red d. yellow e. green 21. Of the following transitions in the Bohr hydrogen atom, the transition results in the emission of the highest-energy photon. a. n = 1 n = 6 b. n = 6 n = 1 c. n = 6 n = 3 d. n = 3 n = 6 e. n = 1 n = Write the complete electron configuration for each of the following elements. Sodium Calcium Tin Arsenic Sulfur Fluorine Silver Oxygen
5 CDO CP Chemistry Unit Write electron configuration using noble gas shorthand and draw the Orbital Diagram for each of the following atoms. Lithium Magnesium Gallium Silicon Nitrogen Sulfur 25. Define the 3 rules that govern electron filling, Hund s Rule, Pauli Exclusion Priniciple and the Aufbau Principle. Give 3 examples of correct orbital diagrams which follow these rules and give 3 separate orbital diagrams which would not follow these rules.
6 26. Draw the electromagnetic radiation spectrum. Clearly label the wavelength, energy and frequency trends and show all the colors in the visible region. 27. List each of the possible shells, which subshell that can exist in each shell, the number of orbitals in each of the subshells and the total electrons for each shell. 28. How many orbitals are in each of the subshells regardless of the shell?
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