I’m sorry I’m only just now seeing your question! Before I memorized anything with numbers or dates, I had a PAO system in place. Maybe there’s another way, but my PAO system has been invaluable in learning numbered or dated lists.
Even for the Oscars, I put them in a memory palace where each location for each movie is populated by my Person from my PAO. This allows me not only to recite the Oscar winners in order, but to be able to recall the winner if given any random year.
By the way, If I see my Person somewhere, I know this always represents a date. Since I made this “rule” it’s made memorizing dates a lot easier.
That being said, when I memorized the periodic table, I didn’t yet use that rule of using Person for dates only. I used either the person, the action, or the object to tell me the atomic number of each element.
I also didn’t use a memory palace for the periodic table, but rather more of a linking story. A downfall of linking stories is that the parts are not numbered. But by inserting something from my PAO with each corresponding element, I’m able to quickly scan my story for the person, the action, or the object of that number to recall the name of the element.