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Elements found in the first two columns of the periodic table contain outer electron shells that are ________; these elements tend to form ________ in solution.

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Final answer:

Elements in the first two columns of the periodic table have outer electron shells that are not completely filled and tend to form positive ions in solution.

Step-by-step explanation:

Elements found in the first two columns of the periodic table contain outer electron shells that are not completely filled; these elements tend to form positive ions in solution.

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