What are the elements that compose 99.9% of your body? In The Elements of Life, Beauty of Science team shows us these 11 elements in three groups: gases and liquids, metals, and non-metallic solid “with an emphasis on different allotropes. The number after each name of the element is its weight percentage in the human body.” From Wikipedia:
Follow this with Beautiful Chemical Reactions, We Are Dead Stars with Dr. Michelle Thaller, and The Ring of Truth: Two Hydrogen Atoms & One Oxygen Atom.
Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium. All 11 are necessary for life. The remaining elements are trace elements, of which more than a dozen are thought on the basis of good evidence to be necessary for life. All of the mass of the trace elements put together (less than 10 grams for a human body) do not add up to the body mass of magnesium, the least common of the 11 non-trace elements.