Matching
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Match each item with the correct statement below. a. | proton | b. | nucleus | c. | atom | d. | electron | e. | neutron |
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1.
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the smallest particle of an element that retains the properties of that
element
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2.
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a positively charged subatomic particle
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3.
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a negatively charged subatomic particle
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4.
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a subatomic particle with no charge
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5.
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the central part of an atom, containing protons and neutrons
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Match each item with the correct statement below. a. | mass number | b. | atomic mass unit | c. | atomic
number | d. | atomic mass | e. | isotope |
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6.
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atoms with the same number of protons, but different numbers of neutrons in the
nucleus of an atom
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7.
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the total number of protons and neutrons in the nucleus of an atom
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8.
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the number of protons in the nucleus of an element
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9.
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the weighted average of the masses of the isotopes of an element
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10.
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one-twelfth the mass of a carbon atom having six protons and six
neutrons
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Multiple Choice Read each question carefully and select the BEST
answer.
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11.
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Who was the man who lived from 460B.C.–370B.C. and was among the first to
suggest the idea of atoms?
a. | Atomos | c. | Democritus | b. | Dalton | d. | Thomson |
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12.
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Dalton's atomic theory included which idea?
a. | All atoms of all elements are the same size. | b. | Atoms of different
elements always combine in one-to-one ratios. | c. | Atoms of the same element are always
identical. | d. | Individual atoms can be seen with a microscope. |
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13.
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The comparison of the number of atoms in a copper coin the size of a penny with
the number of people on Earth is made to illustrate which of the following?
a. | that atoms are indivisible | b. | that atoms are very small | c. | that atoms are very
large | d. | that in a copper penny, there is one atom for every person on
Earth |
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14.
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Why did J. J. Thomson reason that electrons must be a part of the atoms of all
elements?
a. | Cathode rays are negatively-charged particles. | b. | Cathode rays can be
deflected by magnets. | c. | An electron is 2000 times lighter than a
hydrogen atom. | d. | Charge-to-mass ratio of electrons was the same, regardless of the gas
used. |
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15.
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Which of the following is correct concerning subatomic particles?
a. | The electron was discovered by Goldstein in 1886. | b. | The neutron was
discovered by Chadwick in 1932. | c. | The proton was discovered by Thomson in
1880. | d. | Cathode rays were found to be made of protons. |
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16.
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All atoms are ____.
a. | positively charged, with the number of protons exceeding the number of
electrons | b. | negatively charged, with the number of electrons exceeding the number of
protons | c. | neutral, with the number of protons equaling the number of
electrons | d. | neutral, with the number of protons equaling the number of electrons, which is equal
to the number of neutrons |
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17.
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The nucleus of an atom is ____.
a. | the central core and is composed of protons and neutrons | b. | positively charged
and has more protons than neutrons | c. | negatively charged and has a high
density | d. | negatively charged and has a low density |
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18.
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The atomic number of an element is the total number of which particles in the
nucleus?
a. | neutrons | c. | electrons | b. | protons | d. | protons and
electrons |
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19.
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How is the number of neutrons in the nucleus of an atom calculated?
a. | Add the number of electrons and protons together. | b. | Subtract the number
of electrons from the number of protons. | c. | Subtract the number of protons from the mass
number. | d. | Add the mass number to the number of electrons. |
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20.
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What unit is used to measure weighted average atomic mass?
a. | amu | c. | angstrom | b. | gram | d. | nanogram |
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