In cellular biology, active transport is the movement of molecules across a membrane from a region of lower concentration to a region of higher concentration—against the concentration gradient. Active transport requires cellular energy to achieve this movement. There are two types of active transport: primary active transport that uses adenosine triphosphate (ATP), and secondary active transport that uses an electrochemical gradien
One electron is transferred in the ionic bond because sodium needs to lose one electron and chlorine needs to gain one electron to have a full energy shell, which is the ultimate goal in any bond.
