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ch02 - Exam Name MULTIPLE CHOICE. Choose the one...

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ExamName___________________________________MULTIPLE CHOICE.Choose the one alternative that best completes the statement or answers the question.1)The smallest stable units of matter are1)A)molecules.B)neutrons.C)protons.D)atoms.E)electrons.
2)The "atomic number" of an atom is determined by the number of ________ it has.2)
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3)The "atomic weight" of an atom reflects the average number of3)
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4)One mole of any element has the same4)
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5)The nucleus of an atom consists of5)A)protons.B)protons+electrons.C)neutrons.D)protons+neutrons.E)electrons.
6)Isotopes of an element differ in the number of6)
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7)The mass number represents the number of7)
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8)The innermost electron shell in an atom holds up to ________ electrons.8)
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9)Radioisotopes have unstable9)A)isotopes.B)electron clouds.C)nuclei.D)protons.E)ions.
10)By weight, which element is the most plentiful in the human body?10)
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11)Which of these lists contains only trace elements?11)
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12)The atomic number represents the number of12)
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13)Helium (He) has an atomic number of 2. It is chemically stable because it13)A)has a full outer electron shell.B)is neutral in electrical charge.C)lacks electrons, thus the He atom is stable.D)readily ionizes to react with other atoms.E)will form a covalent bond with another He atom.
14)Which element commonly has only a proton as its nucleus?14)
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15)By weight, which element is the second most abundant in the human body?15)
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16)In any given molecule, the sum of the atomic weights of its component atoms is called16)
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