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12 Cards in this Set
- Front
- Back
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Modern Periodic Table |
listing of all the known elements elements are organized by: atomic number and chemical properties |
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Groups |
18 vertical columns elements in a group have similar properties
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Periods |
7 horizontal rows indicate the highest energy level occupied by one or more electrons |
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Elements can be classified as... |
metals non metals metalloids |
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Metals |
highly reactive shinny good conductors of electrcity
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Non Metals |
not reactive grainy/brittle don't give or take electrons |
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Metalloids |
sometimes reactive properties of both metals and non metals semiconductors |
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Valence Electrons |
occupy the highest energy level of an atom play a key role in chemical properties of an element |
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Alkali Metals |
one valence electron 1+ ion reactivity increases from top to bottom of group |
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Alkaline Earth Metals |
2 valence electrons 2+ ions like to give ions away |
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Families |
alkali metals, alkaline earth metals, halogens, noble gases |
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Mendeleev Periodic Table |
organized by atomic mass left spaces for elements that hadn't been discovered yet |
