Chemists can identify the composition of some unknown salts by conducting a flame test. When potassium salts are heated in a flame, a purple color is observed. This is due to the movement of electrons between energy levels. What is the electron configuration of a potassium atom at ground state? (A) 1s 25 2p 3s-3p4d+ (B) 1s 25 2p°3s 3p 3d (C) 1s 25 2d 3s 3d 4s (D) 1s 25 2p 3s 3p%4s

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