How to Read Each Box:
As shown in the image above, there are many pieces of information given inside each box on the table. As labeled, the top number represent the atomic number, which is the number of electrons and protons. The letter in the middle is the symbol for the element. In this case, the "O" symbolizes oxygen. The atomic mass, which is the number at the bottom of the box, is the combined number of protons and neutrons.