The periodic table of the elements is logical. Sometimes. For example, as you go from the top (light elements) to the bottom of the table (heavy elements) the atoms get larger and (usually) rarer. Also, on the left-hand side of the table is where the metals (orange and yellow) reside. Non-metals (green) are on the right-hand side. So, at this point, the periodic table below should at least make some sense. 


Now, let's zoom in on the lightest elements. You will know most of them. Eight are essential for life, especially, carbon, nitrogen, oxygen, phosphorous and sulfur.