Here is a question about this article: The chemical composition of wood varies from species to species, but is approximately 50% carbon, 42% oxygen, 6% hydrogen, 1% nitrogen, and 1% other elements (mainly calcium, potassium, sodium, magnesium, iron, and manganese) by weight. Wood also contains sulfur, chlorine, silicon, phosphorus, and other elements in small quantity.
What is the answer to this question: What element joins potassium, calcium, manganese, iron, and sodium to make a combined 1% of the chemical composition of wood?
magnesium