If the chemical formula is k2so4 what is the number of elements

The chemical compound with the chemical formula K2SO4 consists of potassium  (K), sulfur (S) and oxygen (O) elements. 2 atoms of potassium, 1 atom of sulfur and 4 atoms of oxygen combine to form one molecule of K2SO4. For this reason, the compound consists of 3 elements. They are: potassium with symbol K, sulfur with symbol S and oxygen with symbol O.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.