Understanding the arrangement of elements within the periodic table. Determining the number of electrons in the outermost shell.

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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...that an element has. For example, an element found in group 3A would have 3 electrons in its outermost shell. So, to answer this question, simply check the location of ...