Aplant cell shrinks from lack of water. what term describe the environment outside the cell ?

Plasmolysis is the process in which cells lose water in a hypertonic solution. The reverse process, cytolysis, can occur if the cell is in a hypotonic solution resulting in a lower external osmotic pressure and a net flow of water into the cell. Through observation of plasmolysis and deplasmolysis, it is possible to determine the tonicity of the cell's environment as well as the rate solute molecules cross the cellular membrane.

Mass, charge

Neutrons = 0 charge
Protons + Neutrons = mass number/atomic weight