A dichotomous key is an important scientific tool used to identify different organisms based on the organism's observable traits. Dichotomous keys consist of statements with two choices in each step that will lead users to the correct identification. The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the highest atomic number, oganesson. The atomic number of an element is the number of protons in the nucleus of an atom of that element. You can make a dichotomous key diagram to identify a certain element in the periodic element table.
