Human Composition

If all the material in your body fragmented into the individual elements, most of it would dissipate into the air because it would be gas.

Most of your body elements are gases when they're not in chemical bonds. Oxygen, Hydrogen and Nitrogen would blast out in a plume of particles that are freed from their bonds. 

The largest solid substance left behind would be carbon, nearly 20 kg of carbon would be left behind and a bunch of reactive metals, calcium, potassium, sodium and a bit iron and zinc. There would also be nearly a killo of Phosphorus.