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12 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Alkali Metals |
- 1 valence electron - Very reactive - Never found in nature uncombined - Soft silver-white shiny metals |
Catorgory 1 |
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Alkaline Earth Metals |
- 2 valence electrons - React w/ water - Soft silver-white shiny - Metals never found in nature uncombined |
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Boron Family |
- 3 valence electrons - Contains the element Aluminum - Atoms tend to share/give away electrons in chemical bonds |
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Carbon Family |
- 4 valence electrons - Element called the “basis of life” in this group |
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Nitrogen Family
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- 5 valence electrons |
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Oxygen Family
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- 6 valence electrons - Most abundant element |
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Halogen Family
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- 7 valence electrons
- Most active nonmetals - Atoms gain 1 electron in chemical bonds - Very toxic |
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Noble Gases
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- 8 valence electrons - Stable w/ 8 electrons |
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Democritus |
“A tomos” = atoms. Was a philosopher who thought that everything was made of atoms. |
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Dalton
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He said that all elements are composed of atoms, all atoms of the same element have the same mass, and atoms of different elements have different masses. (element compound ratio)
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Thomson
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When some materials are rubbed they gain the ability to attract or repel each other. Based on this behavior they have either a positive or negative charge. Also, some charged particles can flow from one place to another. The flow of charged particles is called an electric current. (plum pudding ratio)
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Rutherford
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Discovered the nucleaus |
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