A particle is defined as a small potion of matter. From its definition, then a single atom can be considered as an atom. This is because an atom is the smallest unit of matter. Also, a molecule can be considered as a particles since it is a small portion of a certain object.
The answer is excess reactant
What is NAD+... is that when ur NADDY+?
Answer:
it gets euthanized. or it gets put down