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13 Cards in this Set
- Front
- Back
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vertical columns are called: |
groups or families |
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metalloids |
elements that have some metallic and some non metallic properties |
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four families: |
alkaline metals, alkaline earth metals, halogens, noble gases |
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elements #57-71: |
lanthanide series |
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elements #89-103 |
Actinide series |
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john newlands |
-first to organize periodic table -saw every 8th element had similar properties(law of octives) |
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Dmitri mendeleev: |
- organized periodic table into rows according to atomic mass and into columns based on chemical and physical properties. |
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henry moseley |
used atomic number to put elements in order |
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physical properties of metals |
1. efficient conductor of heat & electricity 2. most solid at room temp. (not Hg) 3. lustrous appearance (shiny) 4. malleability (can be hammered into thin sheet) 5. ductility ( pulled into wires) |
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diatomic molecules |
H Br O N Cl I F |
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elements found in uncombined forms |
gold, silver, platinum (noble metals) Group 18 (noble gases) |
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most reactive non metal |
halogens -noble gases dont react |
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non metal properties |
1. dull 2. non conductors 3. brittle (easily break) 4. gas with no color or gas w color |
