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CH 12 Physical Science

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Across
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Group 7A
5
Rows on the periodic table
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Instrument that separates light into a spectrum
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Material that allows heat to flow through it easily
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Found in group 2 on the periodic table
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Average mass of all the known isotopes of an element
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Elements in group 8A
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Elements that are shiny and good conductors of heat and electricity
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Describes matter & energy at extremely small sizes
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Column on the periodic table
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Elements that are poor conductors of heat and electricity
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Number of protons in an atom
Down
2
Subatomic particle that holds a negative charge
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Characteristic color of light given off or absorbed by an element
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Neutral subatomic particle found in the nucleus of the atom
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Chart that organizes elements by their chemical properties and increasing atomic number
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Material with low electrical resistance
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Subatomic particle that holds a positive charge
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Elements in the first group of the periodic table
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Material that allows electricity to flow through it easily
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Can either be positive or negative
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Material that slows down or stops the flow of heat or electricity
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The number of protons and neutrons in the nucleus of the atom
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Atoms of the same element that have different numbers of neutrons