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>
Organic elements, depends on the context of the question but I suspect that is the answer. The organic elements are H,O,C,N,P,S
I believe the answer is a
