Question

how are elements represented on the periodic table? periodic table of the elements o by numbers o by pictures o by chemical symbols o by formulas

Explanation:

Elements on the periodic table are represented by their chemical symbols (e.g., H for Hydrogen, O for Oxygen). Numbers refer to atomic numbers (not the main representation of the element's identity here), pictures are not used, and formulas represent compounds (not single elements). So the correct option is "By chemical symbols".

Answer:

C. By chemical symbols