The âprodromal syndromeâ is not a diagnosis, but the technical term used by mental health professionals to describe a specific group of symptoms that may precede the onset of a mental illness. For example, a runny-nose is often âprodromalâ to (happening before) a cold, which means that a runny-nose may be a risk factor for developing this illness.
These are all that have importance in chemistry. There are some other very small particles, but they are studied by physicists in the field of nuclear particle physics. Electrons are the only particle involved in chemical reactions. Atoms form compounds using chemical reactions. 7 people found this useful.
1 An atom is the smallest indivisible particle of an element which can take part in a chemical change. 2  Atoms can neither be created nor destroyed in a chemical reaction. 3  Atoms of the same element are identical in all respects, having the same size, shape and structure, and especially mass.