Chemistry periodic table

Start by remembering facts about the shape of the table.

Top row has 2 elements.
Second row has elements under those 2, and 6 more sandwiched in between for a total of 8.
Third row is a copy of the second row, 8 elements.
Fourth row has elements under those 8, and 10 more inserted after the second element.
Fifth row is a copy of the fourth row, 18 elements.
And so on.

From there...

You can then remember the coordinates of important elements. (What row is it in, and what element from left-to-right within that row.)
Or you can remember what a column (or "group") is called, and commit to memory the sequence of elements in that column.