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26 Cards in this Set
- Front
- Back
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What is an abbreviated way to write the name of an element consisting of one capital letter or one capital letter and one or two small letters?
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Chemical Symbol
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What is the positively charged center of an atom?
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nucleus
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What are the negatively charged particles that surround the nucleus in an atom?
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electrons
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What are the positively charged particles in a nucleus?
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protons
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What are the neutral particles in a nucleus?
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neutrons
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What is the number of protons in an atom's nucleus, used to identify the element?
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atomic number
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What are two different models of the atom?
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Bohr model & Electron cloud model
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How many electrons can the lowest energy level around a nucleus hold?
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two
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How many electrons can the second energy level around a nucleus hold?
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eight
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What are the smaller particles that make up protons and neutrons?
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quarks
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What is the machine that is used to study quarks?
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Tevatron
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What is the sum of the number of protons and the number of neutrons in the nucleus of an atom?
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mass number
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What are atoms of the same element that have different numbers of neutrons?
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isotopes
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What is the average mass of the mixture of its isotopes?
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average atomic mass
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What is the arrangement of elements into a chart of repeated patterns?
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periodic table
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What are the building blocks of matter?
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atoms
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What are the verticle columns on the periodic table?
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groups or families
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How many groups or families are there on the periodic table?
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18
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What uses the symbol of the element and dots to represent the electrons in the outer energy level?
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dot diagram
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What is group 18 on the periodic table, which contains elements that are stable, or unreactive, and contain outer energy levels that are full?
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noble gases
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What are the horizontal rows of elements in the periodic table?
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periods
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Which elements typically exist as solids at room temperature, are shiny and are good conductors of heat electricity?
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metals
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Which elements are usually gases at room temperature or are brittle solids and are not good conductors of heat or electricity?
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nonmetals
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Which elements have properties of both metals and nonmetals?
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metalloids
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Which elements, in groups 3-12, are metals, but have properties not found in elements of other groups?
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transition elements
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What is an electron that is in the outer shell of an atom and is able to react with other atoms?
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valence electrons
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