The Essential elements OXygen Carbon Hydrogen Nitrogen Potassium Calcium Phosphorus Magnesium Sulfur Silicon Chlorine Molybdenum Iron Manganese Copper Boron Zinc Sodium NickelThe Essential Elements Oxygen Carbon Hydrogen Nitrogen Potassium Calcium Phosphorus Magnesium Sulfur Silicon Chlorine Molybdenum Iron Manganese Copper Boron Zinc Sodium Nickel