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22 Cards in this Set
- Front
- Back
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What is an atom?
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smallest piece of an element, has all properties of that element.
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Democrotis
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first person to make a model of an atom
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Dalton
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found that atoms cannot be created, destroyed, or split
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Thomson
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found that atoms were made of smaller particles
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rutherford
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positive part of an atom in the center called a nucleus
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Bohr
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found that atoms move in fixed paths called energy levels
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atomic #
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# that is the number of protons in an element
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Bohr diagram
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diagram that includes all parts of an element
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chemical symbol
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1, 2, or 3 letters that classify an element
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electron
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particles that zoom around the nucleus.
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energy level
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fixed paths that electrons travel on
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family
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vertical row of elements on the periodic table.
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isotope
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element with a different amount of electrons than usual
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mass number
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the mass of an element
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metalloid
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element with the particles of metals and nonmetals
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metal
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good conductor of heat and electricity.
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nuetron
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other particles in the nucleus, subtract mass # by atomic #
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non-metal
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element with no properties of metals.
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nucleus
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positively charged part of an atom in the center
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period
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horizontal row of elements on the periodic table
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periodic table
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list of all known elements in order of atomic #
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proton
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positively charged particle in the nucleus.
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