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33 Cartas en este set
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- 3er lado (pista)
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What are the VALANCE ELECTRONS of an atom?
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Those electrons that have the highest energy
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What helps determine the chemical properties of an element?
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The number of valance electrons
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How many valance electrons does different elements can have
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1 to 8
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What is an electron dot diagram?
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Includes the symbol for the element surrounded by dots. Each dot stands for one valance electron
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When do atoms tend to be more stable?
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When they have 8 valance electrons
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Name 3 examples of atoms that have 8 valance electrons
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Neon, argon, xenon
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What do atoms tend to form to become more stable?
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Bonds
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What is a chemical bond?
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The force of attraction that holds atoms together as a result of the rearrangement of electrons between them
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How are the elements in the periodic table ordered?
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By increasing atomic number
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An atom's valance electrons are those electrons that have the HIGHEST energy.
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True
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T OR F
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Atoms tend to be stable and nonreactive if they have SIX valance electrons
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False. Eight
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T OR F
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In the periodic table, the number of valance electrons in each element DECREASES from left to right across each period
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False. Increases
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T OR F
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The reactivity of a metal depends on how easily it LOOSES its valance electrons
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True
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T OR F
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What is an ion?
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An atom or group of atoms that has electric charge
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What happens when a neutral atom loses a valance electron?
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It loses a negative charge. It becomes a positive ion
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What happens when a neutral atom gains an electron?
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It gains a negative charge. It becomes a negative ion
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Which atoms are likely to loose electrons?
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Metal atoms
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What is a polyatomic ion?
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An ion that is made of more than 1 atom
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What is an IONIC BOND?
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The attraction between two oppositely charged ions.
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What is an IONIC COMPOUND?
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The resulting compound of the ionic bond
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What is a chemical formula?
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A group of symbols that shows the ratio of elements in a compound
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What do subscripts tell?
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The ratio of elements in a compound
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What is a chemical bond formed when 2 atoms share electrons?
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Covalent bond
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What is a molecule?
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A neutral group of atoms joined by covalent bonds
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What is a double bond?
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When 2 atoms share 2 pairs of electrons
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What is a triple bond?
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When atoms share 3 pairs of electrons
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What is a molecular compound?
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A compound that is made up of molecules
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What are 2 properties of molecular compounds?
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Poor conductivity, low melting and boiling points
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A covalent bond in which electrons are shared equally is a...
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Nonpolar bond
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A covalent bond in which electrons are shared unequally is a...
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Polar bond
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What is a metallic bond?
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An attraction between a positive metal ion and the electrons surrounding it
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What are the properties of metals?
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Luster, malleability and ductility, thermal conductivity
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What is an alloy?
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A mixture made of two or more elements, at least one of them is a metal
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