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32 Cards in this Set
- Front
- Back
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Mendeleev arranged the elements by...
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increasing atomic mass (he was wrong)
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Mosely arranged the elements by....
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increasing atomic number. (he was right)
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The periodic law says...
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physical and chemical properties of elements are periodic functions of their atomic numbers
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Other stuff about Mendeleev
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he left blank spaces in the table and predicted where elements would be
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Columns go up and down. They are called:
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groups or families
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Elements in groups have...
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similar but not idenitical properties
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The horizontal rows are called
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periods (they go side to side)
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The elements in a period are...
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not alike in properties
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The first element is a period is...the last element is....
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1st element is an active solid. Last element is an inacitve gas
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Each square in the periodic table tells you:
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the atomic number, chemical symbol, name, and atomic mass
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the atomic number tells you...
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the number of protons
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Name some physcial properties of metals
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luster (shiny), ductile (drawn into wires), malleable (hammered into sheets)
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chemical properties of metals depend on....
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the number of electrons in the outermost energy level
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Corrosion
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is a chemical propety of metal. Corrosion is the gradual wearing away of a metal due to a chemical reaction
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examples of corrosion
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iron rusting and silver tarnishing
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where are metals on the periodic table?
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to the left of the zig zag line on the table
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where are nonmetals found on the periodic table
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to the right of the zig zag line
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what are the physical properties of nonmetals
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no luster. dull. brittle. do not conduct electricity
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what has lower melintg points and densitites...metals or nonmetals?
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nonmetals
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metals _____ electrons when they form compounds
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lose
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nonmetals _________ electrons when they form compounds
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gain
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the elements on the zigzag line are called
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metalloids
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descirbe metalloids.
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have properties of both metals and nonmetals.
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elements in the same family have similar properties becuase they have the same number of....
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valence electrons
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family 1 is called
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alkali metals
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alkali metals...
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have 1 valence electron, are good conductors of electricity, and bond easily
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examples of alkali compounds
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table salt and baking soda
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family 2 is called
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alkali earth metals
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alkali earth metals...
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are not quite as reactive as alkali metals. Magnesium and calcium are examples
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transition metals
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are between families 2 and 13. examples are iron, cobalt, silver, and gold
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family 13
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called boron family
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family 14
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carbon family
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