Potassium forms bcc structure. Which of the following describes potassium? a. It has an edge length equal to the diameter of one atom, allowing the corner atoms to touch one another. b. It has one atom located at the corner of the cube, and additional atoms placed at the center of each of the six faces of the cube. c. It has a packing efficiency which is not too high; the atom occupies only about 68% of the space.

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