Completion
Complete each statement.
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1.
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The word atom comes from a Greek word that means “unable to be ____________________.”
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2.
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Most atoms have equal numbers of ____________________ and ____________________.
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3.
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A region in which there is a high probability of finding an electron is called a(n) ____________________.
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4.
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An element’s average atomic mass refers to the weighted average of the masses of all of its naturally occurring ____________________.
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5.
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The ____________________ in ____________________ of 1 mole of a substance equals its molar mass.
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6.
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The number of particles in one mole of a substance is referred to as ______________________________.
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7.
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The nucleus of an atom has a(n) ____________________ electric charge.
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8.
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Isotopes of an element have the same atomic ____________________ but different atomic ____________________.
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9.
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The ____________________ is the SI unit that is used for counting small particles, such as atoms.
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10.
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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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11.
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The number of energy levels that are filled in atoms is determined by the number of ____________________.
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12.
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An atom gains energy by absorbing a light particle called a(n) ____________________.
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13.
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The first person who suggested that matter was made up of atoms was the Greek philosopher ____________________.
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14.
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Neutrons and protons are found in the ____________________ of an atom.
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15.
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According to modern atomic theory, the exact location of a(n) ____________________ is uncertain.
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16.
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An atom of potassium has an atomic mass of 39 u and an atomic number of 19. It therefore has ____________________ neutrons in its nucleus.
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17.
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When an atom gains or loses energy, ____________________ jump between energy levels.
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18.
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The chemical properties of an atom are determined by _________________________, which are located in the atom’s outer energy level.
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19.
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An electron that gains energy enters an excited state and absorbs a particle of light called a(n) ____________________.
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20.
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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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21.
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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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22.
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The most familiar semiconductor, ____________________, is one of the most abundant elements in Earth’s crust.
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23.
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Neon is an inert gas because its outer _________________________ is full of electrons.
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24.
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Group 17 halogens form compounds by gaining an electron to become _________________________.
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25.
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One of the important ideas about Mendeleev’s periodic table was that he predicted new ____________________.
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26.
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The periodic law states that, in the modern periodic table, elements with similar ____________________ appear at regular intervals.
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27.
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A group’s elements react similarly because of their _________________________.
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28.
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Some elements are highly ____________________ because their outermost energy levels are only partially filled.
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29.
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Elements that are usually shiny are ____________________.
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30.
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The elements in a family in the periodic table have similar ____________________ and ____________________ properties.
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31.
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The ______________________________ are located in the center of the periodic table.
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32.
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Noble gases are nonreactive gaseous elements that are located in Group ____________________ in the periodic table.
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33.
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Elements called _________________________ can conduct heat and electricity under certain conditions
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34.
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The _________________________ states that when elements are arranged by atomic number, elements with similar properties appear at regular intervals.
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35.
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The number of valence electrons largely determines the ____________________ properties of each group in the periodic table.
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36.
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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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37.
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Nonmetals are sometimes called ____________________ because they do not conduct heat or electricity well.
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38.
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The metals are divided into three families, based on the number of ______________________________ they have.
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39.
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Group 1 of the periodic table consists of the _________________________, a highly reactive group of elements.
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40.
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The ____________________ are reactive elements in Group 17 in the periodic table.
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41.
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Six elements called _________________________, or _________________________, are not metals but have some properties of metals.
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