How are elements classified? Chemistry The Periodic Table The Periodic Table 1 Answer anor277 Aug 18, 2016 By their atomic number, #Z#. Explanation: #Z# defines elemental identity. If #Z=1# the element is hydrogen; if #Z=2# the element is helium;.........If #Z=46# the element is palladium. From where am I getting these numbers? Did I know them from memory? Answer link Related questions How can the periodic table be used to predict new elements? How are the elements are organized in the periodic table? Why is the periodic table a useful tool? How are elements arranged in the modern periodic table? What were the contributions of Mendeleev to the periodic table? Explain how the periodic table is organized? How does IUPAC name elements? Question #fe5fc Question #b9496 Question #8bc3b See all questions in The Periodic Table Impact of this question 2653 views around the world You can reuse this answer Creative Commons License