There are two Na atoms (or moles) at right hand side and two at left hand side. There are two F atoms (or moles) at right hand side and two at left hand side. There is one Mg atom (or mole) at right hand side and one at left hand side.
Firstly, plant cells have a cell wall that surrounds the cell membrane, whereas animal cells do not. Plant cells also possess two organelles that animal cells lack: chloroplasts and a large central vacuole