Completion
Complete each sentence or
statement.
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1.
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The
first person who suggested that matter was made up of atoms was the Greek philosopher
____________________.
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2.
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John
Dalton's atomic theory stated that atoms of the same ____________________ are exactly
alike.
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3.
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The
nucleus of an atom has a(n) ____________________ electric charge.
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4.
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Neutrons and protons are found in the ____________________ of an atom.
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5.
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Atoms
have equal numbers of ____________________ and ____________________.
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6.
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According to modern atomic theory, the exact location of a(n) ____________________ is
uncertain.
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7.
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The
order of elements in the periodic table is based on the number of ____________________ in the
nucleus.
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8.
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The
____________________ states that when elements are listed in order of atomic number, similarities in
their properties will emerge in a regular pattern.
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9.
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Because atoms of elements in the same group of the periodic table have the same number
of ____________________, they have similar properties.
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10.
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The
valence electron of a lithium atom is easily removed to form a lithium ____________________ with a
charge of 1+.
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11.
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Isotopes of an element have the same atomic ____________________ but different atomic
____________________.
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12.
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An
atom of potassium has an atomic mass of 39 amu and an atomic number of 19. It therefore has
____________________ neutrons in its nucleus.
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13.
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____________________, the lightest hydrogen isotope, is the most commonly occurring
hydrogen isotope.
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14.
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Atoms
of alkaline-earth metals, such as calcium, have ____________________ valence electrons.
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15.
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The
____________________ are located in the center of the periodic table.
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16.
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The
____________________ are highly reactive elements located in Group 17 of the periodic
table.
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17.
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Noble
gases are nonreactive gaseous elements that are located in Group ____________________ of the periodic
table.
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18.
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The
most familiar semiconductor, ____________________, is one of the most abundant elements in Earth's
crust.
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19.
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Neon
is an inert gas because its outer ____________________ is full of electrons.
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20.
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Group
17 halogens form compounds by gaining an electron and forming a ____________________.
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21.
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Nonmetals that can conduct heat and electricity under some circumstances are
classified as ____________________.
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22.
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The
____________________ is the SI unit that is used for counting small particles, such as
atoms.
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23.
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The
number of particles in one mole of a substance is referred to as ____________________.
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24.
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Use
the periodic table to determine the molar mass of the element listed. Round the molar mass to two
places to the right of the decimal.
scandium
____________________ g/mol
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25.
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Use
the periodic table to determine the molar mass of the element listed. Round the molar mass to two
places to the right of the decimal.
phosphorus
____________________ g/mol
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26.
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The
molar mass of krypton is 83.80 g/mol. The mass of 5.00 mol of krypton is ____________________
g.
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27.
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When
elements combine to form a(n) ____________________, the resulting properties may be very different
from those of the elements that make it.
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28.
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The
chemical formula H2O means a water molecule contains one ____________________ for every
two ____________________.
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29.
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Formula units of salt, NaCl, contain equal numbers of ____________________ and
____________________.
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30.
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The
distance between the nuclei of two bonded atoms is referred to as ____________________.
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31.
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The
structural formula for a water molecule is ____________________.
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32.
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Networks can be made of bonded ____________________ or
____________________.
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33.
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Atoms
bond in compounds when their ____________________ interact.
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34.
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In
ionic compounds, the positively charged ions are formed from ____________________
elements.
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35.
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The
structure of silicon dioxide consists of a ____________________ of atoms.
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36.
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When
two chlorine atoms bond, they ____________________ a pair of electrons.
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37.
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A(n)
____________________ bond is formed by the attraction between positively charged metal ions and the
____________________ around them.
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38.
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A(n)
____________________ bond is formed when atoms share ____________________ of electrons.
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39.
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Most
covalent compounds have relatively ____________________ melting points.
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40.
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A
compound whose molecules contain one boron atom and three fluorine atoms would be named
____________________.
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41.
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A
compound consisting of Cr3+ ions and OH– ions would be named
____________________.
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42.
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The
charge of each titanium ion in the ionic compound TiO2 is
____________________.
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43.
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The
charge of each iron ion in the ionic compound FeS is ____________________.
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44.
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Each
carbon atom can form a total of ____________________ bonds.
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45.
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In
addition to carbon, organic compounds almost always contain ____________________.
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46.
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____________________ are compounds that have repeating subunits.
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47.
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Organic compounds with carbon-carbon double bonds are referred to as
____________________.
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48.
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Both
starches and sugars are made of the elements ____________________, ____________________, and
____________________.
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49.
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A(n)
____________________ is a polymer made of bonded amino acids.
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50.
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DNA
can ____________________ itself because it is made of two strands that can be
separated.
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