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10 Cards in this Set
- Front
- Back
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Who first developed the periodic table?
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Dimitri Mendeleev and Lothar Meyer
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Periodic Law
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physical and chemical properties of elements are periodic functions of their atomic numbers (protons in the nucleus)
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Parts of the periodic table
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periods (rows), groups (columns)
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metals
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-elements that tend to lose electrons during chemical change and form positive ions.
-found in the left 2/3 of the table -high electrical and thermal conductivities, high malleability and ductility, metallic luster, solid at room temperature. |
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non-metals
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-gain electrons to form negative ions
-found in the right 1/3 of the table -brittle, powdery solids or gases, opposite of metal properties. |
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metalloids
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can go either way as far as gaining or losing electrons.
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alkali metals
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group 1
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alkaline earth metals
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group 2
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halogens
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group 17
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noble gases
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group 18
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