Oxygen, Carbon, and Hydrogen- almost all chemical molecules, 96% of the plant.
Nitrogen- amino acids, proteins, nucleotides, nucleic acids, chlorophylls.
Phosphorus- ATP, nucleic acids, phospholipids.
Potassium- osmosis and ionic balance, stomatal activity.
Sulfur- amino acids and coenzyme A.
Magnesium- chlorophyll molecule.
Calcium- cell walls, cofactors, cellular membrane.