My level of chemistry knowledge is restricted to that which is given at high school level.
I was tought that an element is a substance that consists of only one type of atoms, meaning the number of protons is the same for every atom. Is this definition sound?
In case it is sound:
Since ozone gas only consists of oxygen atoms, would it be correct to say that ozone gas, as an entity, is an element?
Would it be more correct to say that ozone is an allotrope of the element oxygen?
Why is it called the table of elements, when it seems that we are actually listing the atoms and not the elements themselves?