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1 1. Which characteristics describe most nonmetals in the solid phase? (1) They are malleable and have metallic luster. (2) They are malleable and lack metallic luster. (3) They are brittle and have metallic luster. (4) They are brittle and lack metallic luster. 2. The elements of which group consist of monatomic gas molecules at STP? (1) 1 (3) 17 (2) 2 (4) Which element exists as a monatomic gas molecule at STP? (1) nitrogen (3) bromine (2) barium (4) neon 13. Which element is a noble gas? (1) krypton (3) antimony (2) chlorine (4) manganese 14. Which element exists as monatomic molecules at STP? (1) hydrogen (3) argon (2) nitrogen (4) chlorine 15. Which element is classified as a noble gas at STP? (1) hydrogen (3) neon (2) oxygen (4) nitrogen 16. The table below shows some properties of elements A, B, C, and D. 4. Which element is a noble gas? (1) W (3) N (2) Ar (4) Er 5. Which element is a noble gas? (1) antimony (3) gold (2) krypton (4) francium 6. Which group in the Periodic Table contains elements that are all monatomic gases at STP? (1) 15 (3) 17 (2) 16 (4) Which substance can not be decomposed by a chemical change? (1) Ne (3) HF (2) N 2 O (4) H 2 O 8. Which of the following gases is monatomic at STP? (1) hydrogen (3) oxygen (2) chlorine (4) helium 9. Which substance at STP exists in the form of a monatomic gas? (1) neon (3) chlorine (2) oxygen (4) nitrogen 10. Which element at STP exists as monatomic molecules? (1) N (3) Cl (2) O (4) Ne 11. Which group contains elements that are monatomic gases at STP? (1) 1 (3) 17 (2) 2 (4) The number of atoms in a molecule of helium is (1) 1 (3) 3 (2) 2 (4) 4 Which element is most likely a nonmetal? (1) A (3) C (2) B (4) D 17. Nonmetallic elements in the solid phase tend to be (1) malleable (3) brittle (2) ductile (4) conductors 18. Which element is a liquid at STP and has low electrical conductivity? (1) silver (3) barium (2) mercury (4) bromine 19. Which element is brittle and does not conduct heat or electricity? (1) S(s) (3) Al(s) (2) Mg(s) (4) K(s) 20. Which element at STP is a poor conductor of electricity and has a relatively high electronegativity? (1) Cu (3) Mg (2) S (4) Fe 21. In which area of the Periodic Table are the elements with the strongest nonmetallic properties located? (1) lower left (3) lower right (2) upper left (4) upper right Page 1

2 22. Which element is an active nonmetal? (1) neon (3) zinc (2) oxygen (4) chromium 23. Most nonmetals have the properties of (1) high ionization energy and poor electrical conductivity (2) high ionization energy and good electrical conductivity (3) low ionization energy and poor electrical conductivity (4) low ionization energy and good electrical conductivity 24. What are two properties of most nonmetals? (1) high ionization energy and poor electrical conductivity (2) high ionization energy and good electrical conductivity (3) low ionization energy and poor electrical conductivity (4) low ionization energy and good electrical conductivity 25. Which is a property of most nonmetallic solids? (1) high thermal conductivity (2) high electrical conductivity (3) brittleness (4) malleability 26. The properties of silicon are characteristics of (1) a metal, only (2) a nonmetal, only (3) both a metal and a nonmetal (4) neither a metal nor a nonmetal 27. Which element exhibits both metallic and nonmetallic properties? (1) B (3) K (2) Ba (4) Kr 28. The element arsenic (As) has the properties of (1) metals, only (2) nonmetals, only (3) both metals and nonmetals (4) neither metals nor nonmetals 29. Pure silicon is chemically classified as a metalloid because silicon (1) is malleable and ductile (2) is an excellent conductor of heat and electricity (3) exhibits metallic and nonmetallic properties (4) none of the above 30. Which element is not a metaloid? (1) arsenic (3) silicon (2) boron (4) sulfur 31. Which elements are both classified as metalloids? (1) Ge and As (3) B and C (2) Bi and Po (4) Si and P 32. Which is an example of a metalloid? (1) sodium (3) silicon (2) strontium (4) sulfur 33. Which element would have properties characteristic of both a metal and a nonmetal? (1) Ag (3) Si (2) K (4) Xe 34. Which element is a metalloid? (1) Mg (3) Cr (2) Si (4) Ar 35. Which list of elements contains two metalloids? (1) Si, Ge, Po, Pb (3) Si, P, S, Cl (2) As, Bi, Br, Kr (4) Po, Sb, I, Xe 36. Which Group 16 element undergoes natural radioactive disintegration? (1) Po (3) Se (2) S (4) Te 37. Which element is a liquid at room temperature? (1) K (3) Hg (2) I 2 (4) Mg 38. Which Group 16 element has only unstable isotopes? (1) Po (3) Se (2) Te (4) S 39. Which element is a solid at STP? (1) H 2 (3) N 2 (2) I 2 (4) O Which group contains an element that is a liquid at STP? (1) 1 (3) 2 (2) 11 (4) All isotopes of which element in Group 16 are naturally radioactive? (1) S (3) Po (2) Se (4) Te 42. Which period contains elements that are all gases at STP? (1) 1 (3) 3 (2) 2 (4) Radioactive elements include all those elements whose nuclei contain more than (1) 83 amu (3) 83 neutrons (2) 83 nucleons (4) 83 protons 44. What is the total number of elements in Period 2 that are gases at room temperature and standard pressure? (1) 1 (3) 3 (2) 2 (4) 4 Page 2

3 45. At STP, which substance has a crystalline structure? (1) Ne (3) Hg (2) Zn (4) He 46. What is the total number of elements in Group 17 that are gases at room temperature and standard pressure? (1) 1 (3) 3 (2) 2 (4) Which element of Group 17 exists as a solid at 25ºC and standard pressure? (1) fluorine (3) bromine (2) chlorine (4) iodine 48. At STP, potassium is classified as (1) a metallic solid (3) a metallic liquid (2) a nonmetallic solid (4) a metalloid solid 49. A nonmetal which exists in the liquid state at room temperature is (1) aluminum (3) hydrogen (2) mercury (4) bromine 50. In which group are all of the elements solids at STP? (1) 17 (3) 15 (2) 16 (4) A pressure of 152 kpa is equal to how many atmospheres of pressure? (1) 1.00 (3) (2) 2.00 (4) Which element has no stable isotopes? (1) Ar (3) Rn (2) Kr (4) Xe 53. Which group contains elements in three phases of matter at STP? (1) Group 2 (3) Group 15 (2) Group 6 (4) Group Which group in the Periodic Table contains elements that are all gases at STP? (1) 11 (3) 12 (2) 17 (4) The nonmetal that is a liquid at STP is (1) chlorine (3) bromine (2) mercury (4) calcium 56. Which sequence of atomic numbers represents elements which have similar chemical properties? (1) 19, 23, 30, 36 (3) 3, 12, 21, 40 (2) 9, 16, 33, 50 (4) 4, 20, 38, Which element is in Group 2 and Period 7 of the Periodic Table? (1) magnesium (3) radium (2) manganese (4) radon 58. Bromine has chemical properties most similar to (1) fluorine (3) krypton (2) potassium (4) mercury 59. The elements in the Periodic Table are arranged in order of increasing (1) atomic number (3) mass number (2) atomic radius (4) neutron number 60. Base your answer to the following question on the information below. Given: Samples of Na, Ar, As, Rb Which two of the given elements have the most similar chemical properties? 61. Which three groups of the Periodic Table contain the most elements classified as metalloids (semimetals)? (1) 1, 2, and 13 (3) 14, 15, and 16 (2) 2, 13, and 14 (4) 16, 17, and Which of the following Period 3 elements has the least metallic character? (1) Na (3) Al (2) Mg (4) Si 63. Which elements have the most similar chemical properties? (1) K and Na (3) K and Ca (2) K and Cl (4) K and S 64. The properties of carbon are expected to be most similar to those of (1) boron (3) silicon (2) aluminum (4) phosphorus 65. Which group of elements in the Periodic Table contains a metalloid? (1) 1 (3) 13 (2) 7 (4) Which element has properties most like those of magnesium? (1) calcium (3) potassium (2) cesium (4) sodium 67. Which period of the Periodic Table contains more metallic elements than nonmetallic elements? (1) Period 1 (3) Period 3 (2) Period 2 (4) Period 4 Page 3

4 68. The majority of the elements in the Periodic Table are (1) metals (3) metalloids (2) nonmetals (4) noble gases 69. Most of the groups in the Periodic Table of the Elements contain (1) nonmetals, only (3) nonmetals and metals (2) metals, only (4) metals and metalloids 70. Which of the following elements in Period 3 has the greatest metallic character? (1) Ar (3) Mg (2) Si (4) S 71. Elements in the Periodic Table are arranged according to their (1) atomic number (3) relative activity (2) atomic mass (4) relative size 72. What determines the order of placement of the elements on the modern Periodic Table? (1) atomic number (2) atomic mass (3) the number of neutrons, only (4) the number of neutrons and protons 73. The elements in the modern Periodic Table are arranged according to their (1) atomic number (3) atomic mass (2) oxidation number (4) nuclear mass 74. More than two-thirds of the elements of the Periodic Table are classified as (1) metalloids (3) nonmetals (2) metals (4) noble gases 75. As the elements in Group 15 are considered in order of increasing atomic number, which sequence in properties occurs? (1) nonmetal metalloid metal (2) metalloid metal nonmetal (3) metal metalloid nonmetal (4) metal nonmetal metalloid 76. At STP, the element oxygen can exist as either O 2 or O 3 gas molecules. These two forms of the element have (1) the same chemical and physical properties (2) the same chemical properties and different physical properties (3) different chemical properties and the same physical properties (4) different chemical and physical properties 77. At 298 K, oxygen (O 2 ) and ozone (O 3 ) have different properties because their (1) atoms have different atomic numbers (2) atoms have different atomic masses (3) molecules have different molecular structures (4) molecules have different average kinetic energies 78. What is the total number of electrons in a Cr 3+ ion? (1) 18 (3) 24 (2) 21 (4) What is the total number of protons in the nucleus of an F ion? (1) 8 (3) 10 (2) 9 (4) What is the total number of protons in an atom of chlorine? (1) 17 (3) 35 (2) 18 (4) Compared to the radius of a chlorine atom, the radius of a chloride ion is (1) larger because chlorine loses an electron (2) larger because chlorine gains an electron (3) smaller because chlorine loses an electron (4) smaller because chlorine gains an electron 82. Which is the atomic number of an atom with six valence electrons? (1) 6 (3) 10 (2) 8 (4) An atom in the ground state contains three electrons in its outermost principal energy level. This is an atom of an element found in Group (1) 1 (3) 13 (2) 3 (4) Which statement explains why the radius of a lithium atom is larger than the radius of a lithium ion? (1) Metals lose electrons when forming an ion. (2) Metals gain electrons when forming an ion. (3) Nonmetals lose electrons when forming an ion. (4) Nonmetals gain electrons when forming an ion. 85. Which is the atomic number of an atom that forms an ion with 18 electrons and a charge of 2+? (1) 18 (3) 30 (2) 20 (4) An atom of an element has 28 innermost electrons and 7 outermost electrons. In which period of the Periodic Table is this element located? (1) 5 (3) 3 (2) 2 (4) 4 Page 4

5 87. Which electron configuration is correct for a sodium ion? (1) 2 7 (3) (2) 2 8 (4) When an atom loses an electron, the atom becomes an ion that is (1) positively charged and gains a small amount of mass (2) positively charged and loses a small amount of mass (3) negatively charged and gains a small amount of mass (4) negatively charged and loses a small amount of mass 89. If the elements are considered from top to bottom in Group 17, the number of electrons in the outermost shell will (1) decrease (3) remain the same (2) increase 90. A neutral oxygen atom (O) differs from an ion of oxygen (O 2 ) in that the atom has (1) more electrons (3) more protons (2) fewer electrons (4) fewer protons 91. All elements in Period 3 have (1) an atomic number of 3 (2) 3 valence electrons (3) 3 occupied principal energy levels (shells) (4) an oxidation number of Which change occurs when a barium atom loses two electrons? (1) It becomes a negative ion and its radius decreases. (2) It becomes a negative ion and its radius increases. (3) It becomes a positive ion and its radius decreases. (4) It becomes a positive ion and its radius increases. 93. What is the total number of electrons in a Cu + ion? ion? (1) 28 (3) 30 (2) 29 (4) An atom in the ground state contains 8 valence electrons. This atom is classified as a (1) metal (3) noble gas (2) semimetal (4) halogen 95. What is the total number of electrons in a Mg 2+ ion? (1) 10 (3) 12 (2) 2 (4) What is the total number of electrons in the valence shell of an atom of aluminum in the ground state? (1) 8 (3) 3 (2) 2 (4) Which element attains the structure of a noble gas when it becomes a 1+ ion? (1) K (3) F (2) Ca (4) Ne 98. Atom X has an electron configuration of Which electron-dot symbol correctly represents this atom? 99. Which electron-dot symbol represents the atom in Period 4 with the highest first ionization energy? 100. What is the correct Lewis electron-dot structure for the compound magnesium fluoride? 101. Which electron-dot symbol represents an atom of argon in the ground state? 102. Which electron-dot symbol correctly represents an atom of its given element? 103. Which electron-dot symbol represents an atom of chlorine in the ground state? Page 5

6 104. Which Lewis electron-dot structure is drawn correctly for the atom it represents? Which is the correct electron-dot symbol for a boron atom in the ground state? The electron dot symbol above represents an ion of atom X. Atom X could be an atom of (1) K (3) I (2) H (4) S 112. If the electron configuration of an atom of element X is 2-6, the electron dot symbol for the element is 106. Which is the electron-dot symbol for a chlorine atom in the ground state? 107. Which is the correct electron-dot symbol for an aluminum atom in the ground state? 108. Which is the electron-dot symbol for an atom with an electron configuration of 2-5? 109. Which is the correct electron-dot symbol for the fluoride ion? 110. If X: represents the electron-dot symbol of an element, that element could be (1) C (3) B (2) O (4) N 113. Which salt contains an ion that forms a colored solution? (1) Mg(NO 3 ) 2 (3) Ni(NO 3 ) 3 (2) Ca(NO 3 ) 2 (4) Al(NO 3 ) An element with a partially filled d sublevel in the ground state is classified as (1) a halogen (3) an alkali metal (2) a transition metal (4) an alkaline earth metal 115. Which group in the Periodic Table contains an element that can form a blue sulfate compound? (1) 1 (3) 11 (2) 2 (4) A chloride dissolves in water to form a colored solution. The chloride could be (1) HCl (3) CaCl 2 (2) KCl (4) CuCl A solution of Cu(NO 3 ) 2 is colored because of the presence of the ion (1) Cu 2+ (3) O 2 (2) N 5+ (4) NO Which aqueous salt solution has a color? (1) BaSO 4 (aq) (3) SrSO 4 (aq) (2) CuSO 4 (aq) (4) MgSO 4 (aq) 119. In which of the following periods of the Periodic Table are transition elements found? (1) 1 (3) 3 (2) 2 (4) 4 Page 6

7 120. Which set of properties is most characteristic of transition elements? (1) colorless ions in solution, multiple positive oxidation states (2) colorless ions in solution, multiple negative oxidation states (3) colored ions in solution, multiple positive oxidation states (4) colored ions in solution, multiple negative oxidation states 121. When transition elements react chemically, they may lose electrons from the (1) s sublevel, only (3) s and d sublevels (2) p sublevel, only (4) s and p sublevels 122. Which of the following aqueous solutions is blue? (1) Na 2 SO 4 (aq) (3) MgSO 4 (aq) (2) K 2 SO 4 (aq) (4) CuSO 4 (aq) 123. Which element can form a chloride with a general formula of MCl 2 or MCl 3? (1) Fe (3) Al (2) Mg (4) Zn 124. Which compound forms a green aqueous solution? (1) RbCl (3) NiCl 2 (2) CaCl 2 (4) ZnCl Aqueous solutions of compounds containing element X are blue. Element X could be (1) carbon (3) sodium (2) copper (4) sulfur 130. Which element can form more than one binary compound with chlorine? (1) K (3) Fe (2) Ca (4) Zn 131. Which elements contain atoms that form colored ions and have more than one positive oxidation state? (1) alkali metals (3) noble gases (2) alkaline earth metals (4) transition elements 132. An aqueous solution of XCl 2 contains colored ions. Element X could be (1) Ba (3) Ni (2) Ca (4) Bi 133. Which Group 2 element is most active? (1) Sr (3) Ca (2) Mg (4) Ba 134. Which element in Period 4 is classified as an active nonmetal? (1) Ga (3) Br (2) Ge (4) Kr 135. Based upon your knowledge of metallic activity, which element would most likely react the most with water? (1) Zn (3) Fe (2) Cu (4) Li 136. The graph below represents the relationship between atomic radii, in picometers, and increasing atomic number for elements in Group Which aqueous solution is colored? (1) CuSO 4 (aq) (3) KCl(aq) (2) BaCl(aq) (4) MgSO 4 (aq) 127. Which element in Period 5 of the Periodic Table is a transition element? (1) Sr (3) Ag (2) Sb (4) Xe 128. Which atom has multiple oxidation states and forms an ion that is colored when in solution? (1) Cl (3) Cu (2) F (4) Zn 129. Which physical characteristic of a solution may indicate the presence of a transition element? (1) its density (2) its color (3) its effect on litmus (4) the effect on phenolphthalein Which element is most metallic (1) A (3) D (2) B (4) E 137. As elements in Group 15 of the Periodic Table are considered in order from top to bottom, the metallic character of each successive element generally (1) decreases (3) remains the same (2) increases Page 7

8 138. As the elements in Group 2 are considered from beryllium to radium, the degree of metallic activity (1) increases and atomic radius increases (2) increases and atomic radius decreases (3) decreases and atomic radius increases (4) decreases and atomic radius decreases 139. Which of the following Group 15 elements has the most metallic properties? (1) Bi (3) Sb (2) P (4) N 140. Which element in Group 15 is the most metallic? (1) N (3) Bi (2) P (4) As 141. Which is the most active nonmetallic element in Group 16? (1) oxygen (3) selenium (2) sulfur (4) tellurium 142. At which location in the Periodic Table would the most active metallic element be found? (1) in Group 1 at the top (3) in Group 17 at the top (2) in Group 1 at the bottom (4) in Group 17 at the bottom 143. The reactivity of the metals in Groups 1 and 2 generally increases with (1) increased ionization energy (2) increased atomic radius (3) decreased nuclear charge (4) decreased mass 144. Which element in Period 2 of the Periodic Table is the most reactive nonmetal? (1) carbon (3) oxygen (2) nitrogen (4) fluorine 145. As the atomic number of elements within Group 2 increases, the metallic character of each successive element (1) decreases (3) remains the same (2) increases 146. Which element is so active chemically that it occurs naturally only in compounds? (1) potassium (3) copper (2) silver (4) sulfur 147. Which element in Group 15 has the greatest metallic character? (1) nitrogen (3) antimony (2) phosphorus (4) bismuth 148. Which of the following electron configurations represents the least active metal? (1) (3) (2) (4) In which group are all the elements found naturally only in compounds? (1) 18 (3) 11 (2) 2 (4) Which element in Group 17 is the most active nonmetal? (1) Br (3) Cl (2) I (4) F 151. Which element occurs in nature only in compounds? (1) Ca (3) Au (2) Cu (4) Ag 152. In which group of the Periodic Table do most of the elements exhibit both positive and negative oxidation states? (1) 17 (3) 12 (2) 2 (4) An atom that has an electron configuration of is classified as (1) an alkali metal (3) a transition element (2) an alkaline earth metal (4) a noble gas element 154. Because of its high reactivity, which element is normally found only combined with other atoms? (1) sulfur (3) argon (2) lithium (4) gold 155. Which element is relatively inactive at room temperature? (1) nitrogen (3) chlorine (2) oxygen (4) fluorine 156. Which group of elements occur only as compounds in nature because they are extremely reactive? (1) 1 (3) 16 (2) 3 (4) The elements from which two groups of the Periodic Table are most similar in their chemical properties? (1) 1 and 2 (3) 2 and 17 (2) 1 and 17 (4) 17 and Which represents the correct order of activity for the Group 17 elements? [> means greater than.] (1) bromine > iodine > fluorine > chlorine (2) fluorine > chlorine > bromine > iodine (3) iodine > bromine > chlorine > fluorine (4) fluorine > bromine > chlorine > iodine Page 8

9 159. Which of these Group 14 elements has the most metallic properties? (1) C (3) Si (2) Ge (4) Sn 160. Which of the following groups in the Periodic Table contain elements so highly reactive they are never found in the free state? (1) 1 and 2 (3) 2 and 15 (2) 1 and 11 (4) 11 and Which of the following Group 2 elements has the most metallic character? (1) Be (3) Mg (2) Ca (4) Ba 162. Which of these elements has physical and chemical properties most similar to silicon (Si)? (1) germanium (Ge) (3) phosphorus (P) (2) lead (Pb) (4) chlorine (Cl) 163. Which electron configurations represent the first two elements in Group 17 (VIIA) of the Periodic Table? (1) 2-1 and 2-2 (3) 2-7 and (2) 2-2 and 2-3 (4) 2-8 and Which Group of the Periodic Table contains atoms with a stable outer electron configuration? (1) 1 (3) 16 (2) 8 (4) As the atoms of the Group 17 elements in the ground state are considered from top to bottom, each successive element has (1) the same number of valence electrons and similar chemical properties (2) the same number of valence electrons and identical chemical properties (3) an increasing number of valence electrons and similar chemical properties (4) an increasing number of valence electrons and identical chemical properties 166. As the elements in Group 17 are considered in order of increasing atomic number, the chemical reactivity of each successive element (1) decreases (3) remains the same (2) increases 167. Which nonmetal is the most reactive? (1) fluorine (3) bromine (2) chlorine (4) iodine 168. Which element is an alkali metal? (1) Na (3) Al (2) Mg (4) Cl 169. Which element is an alkali metal? (1) hydrogen (3) sodium (2) calcium (4) zinc 170. A diatomic element with a high first ionization energy would most likely be a (1) nonmetal with a high electronegativity (2) nonmetal with a low electronegativity (3) metal with a high electronegativity (4) metal with a low electronegativity 171. Which element is a member of the halogen family? (1) K (3) I (2) B (4) S 172. Which group is known as the halogens? (1) 1 (3) 17 (2) 2 (4) Which group contains elements composed of diatomic molecules at STP? (1) 11 (3) 7 (2) 2 (4) Which Group 15 element exists as a diatomic molecule at STP? (1) phosphorus (3) bismuth (2) nitrogen (4) arsenic 175. Which element in Period 3 exists as diatomic molecules at STP? (1) argon (3) aluminum (2) chlorine (4) sodium 176. The element in Period 2 with the largest atomic radius is (1) a halogen (3) an alkali metal (2) a noble gas (4) an alkaline earth metal 177. Alkali metals, alkaline earth metals, and halogens are elements found respectively in Groups (1) 1, 2, and 18 (3) 1, 2, and 14 (2) 2, 13, and 17 (4) 1, 2, and Which element exists as a diatomic molecule at STP? (1) bromine (3) sulfur (2) argon (4) rubidium 179. In Period 3, from left to right in order, each successive element will (1) decrease in electronegativity (2) decrease in atomic mass (3) increase in number of protons (4) increase in metallic character Page 9

10 180. As the elements of Period 2 are considered in succession from left to right, there is a general decrease in (1) ionization energy (3) metallic character (2) electronegativity (4) nonmetallic character 181. The most active metals are in Group (1) 1 (3) 13 (2) 15 (4) Most metals have the properties of (1) brittleness and high ionization energy (2) brittleness and low ionization energy (3) ductility and high ionization energy (4) ductility and low ionization energy 190. As the elements in Period 3 of the Periodic Table are considered from left to right, the degree of nonmetallic character of each successive element tends to (1) decrease (3) remain the same (2) increase 191. Which element in Period 4 of the Periodic Table exhibits the most nonmetallic properties? (1) Ca (3) Ga (2) Cr (4) Br 192. Which element in Period 2 is the most active metal? (1) neon (3) fluorine (2) beryllium (4) lithium 183. Compared to an atom of potassium, an atom of calcium has a (1) larger radius and lower reactivity (2) larger radius and higher reactivity (3) smaller radius and lower reactivity (4) smaller radius and higher reactivity 184. Which is the most active nonmetal in the Periodic Table of the Elements? (1) Na (3) I (2) F (4) Cl 185. The atoms of the most active nonmetals have (1) small atomic radii and high ionization energies (2) small atomic radii and low ionization energies (3) large atomic radii and low ionization energies (4) large atomic radii and high ionization energies 186. Which group in the Periodic Table contains the most active metals? (1) 1 (3) 17 (2) 3 (4) Which statement is true about the properties of the elements in any one period of the Periodic Table? (1) They are determined by the number of neutrons. (2) They are determined by the number of electrons in the first shell. (3) They change in a generally systematic manner. (4) They change in a random, unpredictable manner Which element has the highest electrical conductivity? (1) Mg (3) He (2) H (4) Cl 189. Which element is more reactive than strontium? (1) potassium (3) iron (2) calcium (4) copper Page 10

11 Answer Key Na and Rb

12 Answer Key

13 Answer Key

14 Answer Key

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