Term
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Definition
| Group 1A. the elements lithium, sodium, potassium, rubidium, cesium, and francium. |
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Term
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Definition
| Group 2A. the elements beryllium, magnesium, calcium, strontium, barium, and radium. |
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Term
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Definition
| different forms of the same element in the same physical state. |
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Term
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Definition
| a negatively-charged atom, or group of atoms. Formed by the addition of one or more extra electrons to an atom. |
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Term
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Definition
| a positively charged atom or group of atoms. A cation is formed by the loss of a negatively charged electron. |
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Term
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Definition
| vertical columns on the periodic table. |
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Term
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Definition
| atom or group of atoms that is not electrically neutral because it gained or lost electrons. |
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Term
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Definition
| horizontal rows on the periodic chart. |
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