Dmitri Mendeleev
<span> Dmitri Mendeleev and Lothar Meyer individually came up with their own periodic law "when the elements are arranged in order of increasing atomic mass,
certain sets of properties recur periodically.</span>
Answer:
It is basically a way of telling you how to solve for different variables in the equation d=m/v
Explanation:
Carbon atom with iron and helium
Electrons and protons because they are essentially always the same