There are 3 elements that make up Beryllium Sulfite (BeSO3). These elements are Beryllium, Sulfur, and Oxygen. This is because the compound Sulfite (SO3) is composed of a sulfite ion, which is created by the merging of oxygen and sulfur.
when ever there are captial letters in like an equation like this count all the ones that are capital and all of those that are capital are how many elements there is lets say this was an element WrTESd there would be 4 elements cause of the letters being capital thats a tip you can use it makes it really easy
