The position of an element on the periodic table scientist predict the
number of electrons an atom will gain or lose during ion formation.
according to the periodic table of elements, which element is most likely to
gain two electrons when it forms an ion?

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?