Term
| How did Mendelev organize the elements in his periodic table? |
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Definition
| "In rows, in order of increasing mass with similar properties in similar columns" |
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Term
| How is the modern periodic table organized? |
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Definition
| Elements are in order of increasing mass |
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Term
| What does the atomic mass of an element depend on? |
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Definition
| It is a weighted average of all isotopes of that element found in nature. |
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Term
| What categories are used to classify elements on the periodic table? |
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Definition
| "Metals, Metalloids, & Nonmetals" |
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Term
| How do properties vary across a period in the periodic table? |
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Definition
| "As one moves right, the elements become less metallic" |
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Term
| Why do elements in the same groups have similar properties? |
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Definition
| They have the same number of valence electrons. |
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Term
| Where are the alkali metals? |
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Definition
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Term
| Where are the alkaline earth metals? |
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Definition
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Term
| What happens to reactivity as one goes DOWN a group? |
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Definition
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Term
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Definition
| an arrangement of elements in columns and rows based on properties that repeat |
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Term
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Definition
| Each row on the periodic table |
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Term
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Definition
| Each column on the periodic table |
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Term
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Definition
| States that properties of each period repeat |
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Term
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Definition
| "Unit created to measure the size of sub atomic particles, protons, neutrons, & electrons" |
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Term
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Definition
| Elements that are good conductors or electricity or heat |
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Term
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Definition
| Elements that form a bridge between metals and nonmetals |
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Term
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Definition
| Elements that are NOT good conductors of electricity or heat |
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Term
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Definition
| Have both metal and nonmetal properties. |
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Term
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Definition
| Electrons of an atom in the outer energy level |
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Term
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Definition
| "Column 1, have 1 valence electron; highly reactive" |
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Term
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Definition
| "Column 2, have 2 valence electrons" |
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Term
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Definition
| "Group 8A, have 8 valence electrons, are stable" |
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Term
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Definition
| "Group 7A, have 7 valence electrons, highly reactive" |
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