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    Understanding the periodic table and electron configurations

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    Three elements are listed below. How many electrons does each have in its outermost electron shell?

    (1) aluminum
    (2) krypton
    (3) potassium

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    https://brainmass.com/chemistry/the-periodic-table/understanding-the-periodic-table-and-electron-configurations-1739

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    A good understanding of the periodic table helps in answering this question. The periodic table organizes elements according to the number of free outer-shell electrons ...

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