Which atomic model was proposed by the scientist who performed an experiment using gold foil and alpha particles? which statement best explains why mercury is considered an element? a. it is a metal that is a poor conductor of heat. b. it is a metal that is naturally a liquid at room temperature. c. it is a poison that is easily absorbed through unbroken skin. d. it is a substance that cannot be chemically broken down any further.

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.