Elements at the top right of the periodic table have high ionization energies because
A. their atomic radius is small
B. these elements are high in electronegativity
c. they have fewer electron shells to shield the protons from the
electrons
I D. layers of electron shells shield the protons' attractive force
Multiple choice

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.