Substances that cannot be separated and found on a periodic table are elements.
Answer:
Hi, this is a super vague question, so its pretty confusing to answer. Could you please be a bit more specific?
If you are referring to chemistry, then how you tell "what is what" is by the molecular makeup of an element (Periodic table), and "how that..affects what", chemical reactions can occur between elements
Answer: I believe the answer is an earthquake.
Explanation: Sorry If I am wrong!