10. Which of the following best describes an orbital? (A) Space where electrons are unlikely to be found in an atom. (B) Space which may contain electrons, protons, and/or neutrons. (C) The space in an atom where an electron is most likely to be found. (D) Small, walled spheres that contain electrons. (E) A single space within an atom that contains all electrons of that atom.

20. Consider the following representation of a 2p-orbital: Which of the following statements best describes the movement of electrons in a p-orbital? (A) The electrons move along the outer surface of the p-orbital, similar to a figure “8” type of movement. (B) The electrons move within the two lobes of the p-orbital, but never beyond the outside surface of the orbital. (C) The electrons are concentrated at the center (node) of the two lobes. (D) The electrons are only moving in one lobe at any given time. (E) The electron movement cannot be exactly determined.

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