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FINAL EOC REVIEW – SHEET 1 1. The characteristic bright-line spectrum of an element is produced when electrons a. fall back to lower energy levels b. are gained by a neutral atom c. are emitted by the nucleus as beta particles d. move to higher energy levels 2. Compared with an atom of C-12, an atom of C-14 has a. More protons b. Fewer protons c. More neutrons d. Fewer neutrons 3. How many electrons are present in the electron-dot diagram of an atom with atomic number 9? a. 2 b. 7 c. 9 d. 11 4. If atom X is represented by 126X and atom Y is represented by 146Y, then X and Y are: a. isotopes of the same element b. isotopes of different elements c. ions of the same element d. ions of different elements 5. When an atom goes from the excited state to the ground state, the total energy of the atom a. Decreases b. Increases c. remains the same 6. Which of the following represents the electron configuration of an atom in the excited state? a. 1 – 1 b. 2 – 8 c. 2 - 8 – 2 d. 2 - 8 – 18 7. A sample of element X contains 90% 35X atoms, 8% 37 X atoms, and 2% 38X atoms. The weighted -atomic average mass is closest to a. 32 b. 35 c. 37 d. 38 8. The atomic number of an atom is always equal to the number of a. neutrons in the nucleus b. protons in the nucleus c. neutrons plus protons in the atom d. protons plus electrons in the atom 9. What is the number of electrons in an atom with an atomic number of 13 and a mass number of 27? a. 13 b. 14 c. 27 d. 40 10. Which two particles have approximately the same mass? a. neutron and electron b. neutrons and deuteron c. proton and neutron d. proton and electron 11. The mass number of an atom is equal to the number of a. neutrons, only b. protons, only c. neutrons plus protons d. electrons plus protons 12. An atom of 22688Rn contains: a. 88 protons and 138 neutrons b. 88 protons and 138 electrons c. 88 electrons and 226 neutrons d. 88 electrons and 226 protons 13. Which is the best description of an orbital as used in the wave-mechanical model of an atom? a. trajectory of shared electrons b. plot of probability of electron location c. path of travel of electrons around the nucleus d. simplest component of the emission spectrum 14. Which scientist played the greatest role in the development of the model of the atom? a. J. Willard Gibbs b. Stephen Jay Gould c. Throckmorton P. Guildersleeve d. Ernest B. Rutherford 15. Which numbered arrow in the diagram below gives the best indicator of the time at which the particle model of the atom became generally accepted by chemists and physicists? 16. In the particle model of the atom, which nuclei of atoms are surrounded by negatively charged electrons? a. all nuclei b. only nuclei with more electrons than protons c. only nuclei with more neutrons than protons d. only nuclei with the same number of protons as neutrons 17. How is an atom of 3919K different from an atom of 40 18Ar? a. The K atom has fewer electrons. b. The K atom has fewer protons. c. The K atom has fewer neutrons. d. The K atom has a greater neutron/proton ratio. 18. Which property accounts for the fact that atoms can be identified by examination of an emission spectrum? a. Each kind of atom has a different atomic number. b. Each kind of atom has a different mass number. c. Each kind of atom has a characteristic difference in atomic radius. d. Each kind of atom has a characteristic difference in energy levels for electrons 19. Which property is most closely related to similarity in chemical properties of the elements? a. number of neutrons b. number of protons c. number of valence electrons d. number of occupied energy levels FINAL EOC REVIEW – SHEET 1 26. What is the maximum number of electrons that can occupy the second principal energy level? a. 6 b. 8 c. 18 d. 32 27. Which principal energy level can hold a maximum of 18 electrons? a. 5 b. 2 c. 3 d. 4 28. Which is the correct electron dot representation of an atom of sulfur in the ground state? 20. Which phenomenon is best represented by this diagram? a. gain of energy as seen in an emission spectrum b. loss of energy as seen in an emission spectrum c. gain of energy as seen in an absorption spectrum d. loss of energy as seen in an absorption spectrum 21. Which lists the three major subatomic particles in order of increasing mass? a. electron, proton, neutron b. electron, neutron, proton c. neutron, electron, proton d. proton, neutron, electron 22. When these four components of the electromagnetic spectrum (listed in alphabetical order) are listed in order of increasing energy, which occupies the third position? infrared, microwaves, ultraviolet, and visible a. Infrared b. Microwaves c. Ultraviolet d. Visible 23. When these four components of the electromagnetic spectrum (listed in alphabetical order) are listed in order of increasing wavelength, which occupies the third position? infrared, visible, ultraviolet, and X rays a. Infrared b. Visible c. Ultraviolet d. X-rays 24. Which is the best definition of valence electrons? a. electrons lost by an atom during a chemical reaction b. electrons gained by an atom during a chemical reaction c. electrons found in the outer energy level of a ground state atom d. electrons found in the outer energy level of an excited state atom 25. The weighted-average atomic mass for bromine as reported on the Periodic Table is 79.9. There are two naturally occurring isotopes of bromine. The isotope, bromine-79, accounts for about 51% of naturally occurring bromine. Which isotope accounts for the other 49%? a. bromine-80 b. bromine-81 c. bromine-82 d. bromine-83 a. S: b. S: c. :S: d. :S: 29. The total number of d-orbitals in the 3rd principal energy level is a. 1 b. 5 c. 3 d. 7 30. The “kernel” usually includes all parts of the atom except: a. Neutrons b. Protons c. Valence electrons d. Orbital electrons 31. The amount of energy required to remove the most loosely bound electron from an atom in the gaseous phase is called: a. Kinetic energy b. Potential energy c. Ionization energy d. Electron affinity 32. What is the maximum number of sublevels in the third principal energy level? a. 1 b. 2 c. 3 d. 4 33. The number of valence electrons in an atom with an electron configuration of 1s22s22p63s23p4 is a. 6 b. 2 c. 16 d. 4 34. Which diagram correctly represents an atom of fluorine in an excited state? 35. In an atom, the s sublevel has a. 1 orbital b. 5 orbitals c. 3 orbitals d. 7 orbitals 36. What is the maximum number of electrons that can occupy an orbital? a. 1 b. 2 c. 3 d. 6 37. Which electron configuration represents three halffilled orbitals? a. b. c. d. 1s22s22p6 1s22s22p5 1s22s22p3 1s22s22p4