Completion
Complete each
statement.
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1.
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The concept that matter was composed of tiny indivisible particles was
originally given by ____________________.
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2.
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Researchers discovered a subatomic particle while working with the cathode ray
tube. The particle is known as a(n) ____________________.
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3.
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A ____________________ is a subatomic particle that has mass nearly equal to
that of a proton, but it carries no electrical charge.
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4.
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Atoms with the same number of protons but different number of neutrons are
called ____________________.
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5.
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Uranium is a naturally occurring element that emits particles and rays
spontaneously through a process called _____________________.
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6.
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An alpha particle is _____________________ charged with two protons and
neutrons.
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7.
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In the equation  , the ___________________ decay
of radioactive carbon-14 results in the creation of a new nitrogen-14 atom.
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8.
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A beta particle consists of a fast moving electron and has a(n)
_____________________ charge.
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9.
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In nanotechnology, individual atoms are seen using the ____________________
microscope.
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10.
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The mass of an electron is ____________________ g.
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11.
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James Chadwick showed that the nucleus also contained a neutral subatomic
particle known as the ____________________.
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12.
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Democritus believed that matter is made up of tiny individual particles known as
a(n) ____________________.
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13.
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The number of protons in an atom is called the ____________________ of the
element.
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Short Answer
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14.
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Write the nuclear equation to describe the alpha decay of  .
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15.
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Compare and contrast mass number and atomic mass. 
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16.
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What is the average atomic mass of this element? | Isotope | Mass (amu) | Percent Abundance | | Phosphorus-29 | 29 | 5% | | Phosphorus-31 | 31 | 71% | | Phosphorus-32 | 32 | 24% | | | |
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17.
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What is the average atomic mass of this element? | Isotope | Mass (amu) | Percent Abundance | | Silver-105 | 105 | 48% | | Silver-108 | 108 | 43% | | Silver-109 | 109 | 9% | | | |
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18.
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Write the chemical symbol for the isotope of cobalt with 37 neutrons.
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19.
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Identify the missing particle in the equation below. Justify your
response. 
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20.
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Write the nuclear equation to describe the beta-decay of boron-12.
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21.
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Element X has an average atomic mass of 64.32 amu. If this element consists of
only two isotopes, X-64 and X-65, which isotope is present in the greater abundance? Explain how you
can tell.
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22.
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Define an atom.
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23.
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What do you understand by the term atomic mass unit (amu)?
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24.
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What is a nuclear reaction?
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25.
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How are atomic number and mass number denoted in the chemical symbol of the
isotope of an element? Express the shortened notation for an isotope of element X with atomic number
92 and atomic mass 238.
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26.
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Identify the element containing 34 protons.
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27.
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What were the main flaws in Dalton’s atomic theory?
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28.
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Fast moving electrons travel through the empty space surrounding the nucleus.
How are electrons held within the atom?
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