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| 1.
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Which of the following models of the atom reflects the unpredictable motion of the electron?
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| | A) | electron cloud |
| | B) | solid ball the same throughout |
| | C) | ball of raisin-cookie dough with raisins representing electrons |
| | D) | small ball within a large shell containing empty space |
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| 2.
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An atom containing six positive charges and six negative charges has __________ charge.
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| | A) | a strong negative |
| | B) | a positive |
| | C) | a negative |
| | D) | no net |
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| 3.
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The __________ of an element is the number of __________ of an atom of that element.
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| | A) | atomic mass, electrons in the nucleus |
| | B) | atomic number, protons in the nucleus |
| | C) | mass number, protons plus neutrons in the outermost energy level |
| | D) | mass number, neutrons in the nucleus |
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| 4.
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The atomic mass of an element is __________ of that element.
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| | A) | the number of electrons in each atom |
| | B) | the number of protons plus the number of neutrons of an atom |
| | C) | the average mass of an atom |
| | D) | the number of protons in each atom |
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| 5.
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__________ are atoms of the same element that have different numbers of neutrons.
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| | A) | Isotopes |
| | B) | Beta particles |
| | C) | Compounds |
| | D) | Alpha particles |
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| 6.
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Which of the following is the correct chemical symbol for carbon?
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| | A) | Ca |
| | B) | Crbn |
| | C) | Car |
| | D) | C |
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| 7.
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The discovery of the sixth quark was accomplished by __________.
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| | A) | experimenting with a cathode ray tube |
| | B) | using the Hubble Space telescope |
| | C) | studying proton collisions |
| | D) | bombarding gold foil with alpha particles |
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| 8.
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Atoms consist of a positively charged center called a(n) __________.
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| | A) | electron |
| | B) | proton |
| | C) | nucleus |
| | D) | neutron |
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| 9.
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Scientists have broken down protons and neutrons into smaller particles called __________.
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| | A) | vacuoles |
| | B) | quarks |
| | C) | isotopes |
| | D) | nuclei |
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| 10.
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Aristotle believed that matter was __________.
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| | A) | uniform throughout |
| | B) | capable of being broken down into smaller parts |
| | C) | composed of atoms |
| | D) | composed of molecules |
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| 11.
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Democritus believed that the universe was made of empty space and __________.
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| | A) | molecules |
| | B) | elements |
| | C) | atoms |
| | D) | compounds |
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| 12.
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A(n) __________ is a method of representing atoms and the electrons in their outer energy levels.
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| | A) | electron dot diagram |
| | B) | chemical formula |
| | C) | chemical symbol |
| | D) | chemical equation |
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| 13.
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The __________ is a chart created by chemists to organize the elements according to repeated changes on properties.
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| | A) | isotope |
| | B) | periodic table |
| | C) | metalloid list |
| | D) | mass number |
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| 14.
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The mass of a proton is measured in __________.
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| | A) | atomic mass units |
| | B) | microns |
| | C) | minutiae |
| | D) | nanograms |
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| 15.
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Who formed the first periodic table?
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| | A) | Dalton |
| | B) | Moseley |
| | C) | Democritus |
| | D) | Mendeleev |
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| 16.
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Which of the following best describes the three general groups of elements?
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| | A) | metals, metalloids, and synthetics |
| | B) | solid, liquid, and gas |
| | C) | metals, nonmetals, and noble gases |
| | D) | metals, metalloids, and nonmetals |
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| 17.
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Which of the following atomic particles is positively charged?
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| | A) | neutron |
| | B) | electron |
| | C) | negatron |
| | D) | proton |
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| 18.
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Which of the following methods would be most useful for describing atoms?
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| | A) | touching with bare hands |
| | B) | constructing a model |
| | C) | visualizing with a microscope |
| | D) | observing in a test tube |
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| 19.
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The atomic number of manganese is 25; its mass number is 55. How many neutrons does an atom of manganese have in its nucleus?
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| | A) | 80 |
| | B) | 25 |
| | C) | 30 |
| | D) | 55 |
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| 20.
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The __________ of an atom is the number of neutrons plus protons.
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| | A) | nucleus number |
| | B) | half-life |
| | C) | mass number |
| | D) | atomic number |
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