______ is the outermost shell for elements of period 2.

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L is the outermost shell for elements of period 2. Explanation: In the periodic table, the period number indicates the number of electron shells occupied by an element. • Period 1 elements have electrons only in the K shell (the 1st shell). • Period 2 elements have electrons in the K and L shells, making the L shell (the 2nd shell) their outermost shell.

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