Using dots to represent potassium’s 19 electrons, fill the subshells in the diagram below to arrive at the ground-state energy- level diagram for the potassium atom. Select the diagram that gives an answer consistent with the periodic table.

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Shells n = 4 n = 3 n = 2 n = 1 Increasing energy Increasing energy Subshells 4f 4d 4p 3d 4s 3p 3s -2p 2s 1s Remember-an s subshell can accommodate 2 electrons, a p subshell can accommodate 6 electrons, and a d subshell can accommodate 10 electrons.