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.
In order to write an equation for a nuclear reaction, we must first establish some basic rules. Each of the elements involved in the reaction is identified by the chemical symbol. Two numbers are attached to the symbol. The number at the upper right is the mass number, also known as the A number. The 'A' number describes the atomic weight of the atom and identifies the number of protons and neutrons in the nucleus. The number at the lower left is the atomic number, or Z number. The 'Z' number describes the number of protons in the nucleus and determines the type of atom.