2. All of the atoms of argon have the same. 1. The atomic number of an atom is always equal to the total number of. A. mass number B.

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1 1. The atomic number of an atom is always equal to the total number of A. neutrons in the nucleus B. protons in the nucleus 2. All of the atoms of argon have the same A. mass number B. atomic number C. number of neutrons D. number of nucleons C. neutrons plus protons in the atom D. protons plus electrons in the atom 3. An atom of an element contains 20 protons, 20 neutrons, and 20 electrons. This element is A. an alkali metal B. an alkaline earth metal 4. What is the atomic number of an element whose atoms each contain 47 protons, 60 neutrons, and 47 electrons? A. 13 B. 47 C. 60 D. 107 C. a halogen D. a noble gas

2 5. The atomic number of an alkali metal is A. 1 B. 11 C. 14 D The properties of elements are periodic functions of their A. mass numbers B. atomic masses C. atomic radii D. atomic numbers 7. Which atom has a nucleus that contains 13 protons and 14 neutrons? 8. The atomic number of any atom is equal to the number of A. Mg B. Be C. Al D. N A. neutrons in the atom only B. protons in the atom, only C. neutrons plus protons in the atom D. protons plus electrons in the atom

3 9. A particle of matter contains 6 protons, 7 neutrons, and 6 electrons. This particle must be a A. neutral carbon atom B. neutral nitrogen atom 10. What is the total number of protons and neutrons in the nuclide Br? A. 35 B. 45 C. 80 D. 115 C. positively charged carbon ion D. positively charged nitrogen ion 11. As the number of neutrons in the nucleus of a given atom of an element increases, the atomic number of that element A. decreases B. increases 12. What is the atomic number of an element that has six protons and eight neutrons? A. 6 B. 2 C. 8 D. 14 C. remains the same

4 13. The elements in the Periodic Table are arranged in order of increasing 14. Which notation represents an atom of sodium with an atomic number of 11 and a mass number of 24? A. atomic number B. atomic radius C. mass number D. neutron number A Na B Na C Na D Na 15. Which quantity identifies an element? 16. The diagram below represents the nucleus of an atom. A. atomic number B. mass number C. total number of neutrons in an atom of the element D. total number of valence electrons in an atom of the element What are the atomic number and mass number of this atom? A. The atomic number is 9 and the mass number is 19. B. The atomic number is 9 and the mass number is 20. C. The atomic number is 11 and the mass number is 19. D. The atomic number is 11 and the mass number

5 17. Each diagram below represents the nucleus of a different atom. 18. Which two particles have approximately the same mass? A. neutron and electron B. neutron an deutron Which diagrams represent nuclei of the same element? C. proton and neutron D. proton and electron A. D and E, only B. D, E, and Q C. Q and R, only D. Q, R, and E 19. 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 20. An atom of 226 Rn contains 88 A. 88 protons and 138 neutrons B. 88 protons and 138 electrons C. 88 electrons and 226 neutrons D. 88 electrons and 226 protons

6 21. If the nucleus of an atom is represented as 24 X, the 11 atom is A. Na B. Al C. Mg D. Br 22. The nucleus is the part of the atom that A. consist mostly of empty space B. has a negative charge C. occupies most of the atom s total volume D. contains most of the atom s total mass 23. The total number of protons and neutrons in the nuclide 37 Cl is 17 A. 54 B. 37 C. 20 D What is the mass number of an atom which contains 21 electrons, 21 protons, and 24 neutrons? A. 21 B. 42 C. 45 D. 66

7 25. What is the mass number of an ion that has 83 protons, 80 electrons, and 126 neutrons? 26. Which atom is used as the standard for determining the relative masses of all other elements? A. 83 B. 206 C. 209 D. 289 A. 24 Mg B. 16 O C. 12 C D. 1 H 27. The nucleus of an atom of I contains A. 53 neutrons and 127 protons B. 53 protons and 127 neutrons C. 53 protons and 74 neutrons D. 53 protons and 74 electrons 28. An atom that contains 8 protons, 8 electrons, and 9 neutrons has A. an atomic number of 9 B. an atomic number of 16 C. a mass number of 17 D. a mass number of 25

8 29. One atomic mass unit (1 amu) is equal to the mass of a carbon-12 atom multiplied by the quantity 30. Compared to the entire atom, the nucleus of the atom is A. 12 B C D A. smaller and contains most of the atom s mass B. smaller and contains little of the atom s mass C. larger and contains most of the atom s mass D. larger and contains little of the atom s mass 31. What is the mass number of an atom which contains 28 protons, 28 electrons, and 34 neutrons? 32. The mass number of an atom is always equal to the total number of its A. 28 B. 56 C. 62 D. 90 A. electrons, only B. protons, only C. electrons plus protons D. protons plus neutrons

9 33. The major portion of an atom s mass consists of A. electrons and protons B. electrons and neutrons 34. What is the mass number of an atom that contains 19 protons, 19 electrons, and 20 neutrons? A. 19 B. 20 C. 39 D. 58 C. neutrons and positrons D. neutrons and protons 35. The atomic mass of an element is defined as the weighted average mass of that element s A. most abundant isotope B. least abundant isotope 36. What is the total number of protons and neutrons in an atom of Rb? A. 37 B. 49 C. 86 D. 123 C. naturally occurring isotopes D. radioactive isotopes

10 37. The atomic mass unit is defined as exactly 1 12 the mass of an atom of 38. In which list are the elements arranged in order of increasing atomic mass? A C B C C Mg D Mg A. Cl, K, Ar B. Fe, Co, Ni C. Te, I, Xe D. Ne, F, Na 39. An atom of carbon-12 and an atom of carbon-14 differ in 40. The atomic mass of an element is calculated using the A. atomic number B. mass number C. nuclear charge D. number of electrons A. atomic number and the ratios of its naturally occurring isotopes B. atomic number and the half-lives of each of its isotopes C. masses and the ratios of its naturally occurring isotopes D. masses and the half-lives of each of its isotopes

11 41. Compared to an atom of phosphorus-31, an atom of sulfur-32 contains 42. What is the mass number of an atom that has six protons, six electrons, and eight neutrons? A. one less neutron B. one less proton A. 6 B. 12 C. 14 D. 20 C. one more neutron D. one more proton 43. Which diagram represents the nucleus of an atom of Al? A. B. 44. Which isotopic notation represents an atom of carbon-14? A. 6 8 C B. 8 6 C C C D C C. D.

12 45. Which isotopic notation identifies a metalloid that is matched with the corresponding number of protons in each of its atoms? 46. The most common isotope of chromium has a mass number of 52. Which notation represents a different isotope of chromium? A. 24 Mg and 12 protons B. 28 Si and 14 protons A Cr B Cr C Cr D Cr C. 75 As and 75 protons D. 80 Br and 80 protons 47. What is the mass number of a carbon atom that contains six protons, eight neutrons, and six electrons? 48. The number of protons in the nucleus of P is A. 15 B. 17 C. 32 D. 47 A. 6 B. 8 C. 14 D. 20

13 49. How many protons are present in an atom of P? 50. The number of protons in an atom of 3 1 H is A. 15 B. 16 C. 31 D. 46 A. 1 B. 2 C. 3 D Compared to an atom of calcium-40, an atom of potassium-39 contains fewer A. protons B. neutrons 52. Which atom contains exactly 15 protons? A. phosphorus-32 B. sulfur-32 C. oxygen-15 D. nitrogen-15 C. occupied sublevels D. occupied principal energy levels

14 53. An atom of 40 Ar has a nucleus that contains a total 18 of 54. The mass of a calcium atom is due primarily to the mass of its A. 18 electrons B. 18 protons C. 18 neutrons D. 18 nucleons A. protons, only B. neutrons, only C. protons and neutrons D. protons and electrons 55. What is the total number of protons contained in the nucleus of a carbon-14 atom? 56. Which subatomic particles have a mass of approximately 1 atomic mass unit each? A. 6 B. 8 C. 12 D. 14 A. proton and electron B. proton and neutron C. neutron and positron D. electron and positron

15 57. What is the charge and mass of a proton? A. charge of +1 and mass of 1 amu B. charge of +1 and mass of amu 58. An atom contains 22 neutrons and 40 nucleons. What is the total number of protons in the atom? A. 18 B. 22 C. 40 D. 62 C. charge of 1 and mass of 1 amu D. charge of 1 and mass of amu 59. What is the structure of a krypton-85 atom? A. 49 electrons, 49 protons, and 85 neutrons B. 49 electrons, 49 protons, and 49 neutrons C. 36 electrons, 36 protons, and 85 neutrons D. 36 electrons, 36 protons, and 49 neutrons 60. Subatomic particles can usually pass undeflected through an atom because the volume of an atom is composed of A. an uncharged nucleus B. largely empty space C. neutrons D. protons

16 61. What is the total number of protons in the nucleus of an atom of potassium 42? 62. Which statement is true about the charges assigned to an electron and a proton? A. 15 B. 19 C. 39 D. 42 A. Both an electron and a proton are positive. B. An electron is positive and a proton is negative. C. An electron is negative and a proton is positive. D. Both an electron and a proton are negative. 63. Which of these phrases best describes an atom? A. a positive nucleus surrounded by a hard negative shell B. a positive nucleus surrounded by a cloud of negative charges C. a hard sphere with positive particles uniformly embedded D. a hard sphere with negative particles uniformly embedded 64. Which statement is true about a proton and an electron? A. They have the same masses and the same charges. B. They have the same masses and different charges. C. They have different masses and the same charges. D. They have different masses and different charges.

17 65. A student constructs a model for comparing the masses of subatomic particles. The student selects a small, metal sphere with a mass of 1 gram to represent an electron. A sphere with which mass would be most appropriate to represent a proton? 1 1 A. 1 g B. 2 g C g D g 66. The total mass of the protons in an atom of gold-198 is approximately A. 79 atomic mass units B. 119 atomic mass units C. 198 atomic mass units D. 277 atomic mass units 67. An atom is electrically neutral because the 68. The mass of 12 protons is approximately equal to A. number of protons equals the number of electrons B. number of protons equals the number of neutrons C. ratio of the number of neutrons to the number of electrons is 1 : 1 D. ratio of the number of neutrons to the number of protons is 2 : 1 A. 1 atomic mass unit B. 12 atomic mass units C. the mass of 1 electron D. the mass of 12 electrons

18 69. A proton has a charge that is opposite the charge of A. an alpha particle B. a neutron C. an electron D. a positron 70. Which subatomic particles are located in the nucleus of a neon atom? A. electrons and positrons B. electrons and neutrons C. protons and neutrons D. protons and electrons 71. Which two particles each have a mass approximately equal to one atomic mass unit? A. electron and neutron B. electron and positron C. proton and electron D. proton and neutron 72. Which two particles have opposite charges? A. an electron and a neutron B. an electron and a proton C. a proton and a neutron D. a proton and a positron

19 73. Which statement compares the masses of two subatomic particles? 74. Which nucleus contains the greatest number of neutrons? A. The mass of an electron is greater than the mass of a proton. A S B S C P D P B. The mass of an electron is greater than the mass of a neutron. C. The mass of a proton is greater than the mass of an electron. D. The mass of a proton is greater than the mass of a neutron. 75. In which pair of atoms do both nuclei contain the same number of neutrons? A. 7 3 Li and 9 4 Be B. 40K and Cl C. 40Ca and Ar D N and 16 8 O 76. Which nucleus is from an isotope of an atom with 6n the nucleus 6p? A. 6n 6p *YT* B. 4n 8p *YT* C. 8n 6p *YT* D. 6n 8p *YT*

20 77. What is the total number of neutrons in an atom of 7 3 Li? A. 7 B. 10 C. 3 D What are the characteristics of a neutron? A. It has no charge and no mass. B. It has no charge and a mass of 1 amu. C. It has a charge of +1 and no mass. D. It has a charge of +1 and a mass of 1 amu. 79. What is the total number of neutrons in an atom of an element that has a mass number of 19 and an atomic number of 9? A. 9 B. 10 C. 19 D A Ca 2+ ion differs from a Ca 0 atom in that the Ca 2+ ion has A. more protons B. fewer protons C. more electrons D. fewer electrons

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