List chemical elements - wikipedia, As of december 2015, 118 chemical elements are identified. a chemical element or element a type of atom having the same number of protons in their atomic nuclei (i.e. Html table export, Export htlm table in different formats like json, xml, pdf, png, xls, word, powerpoint. Alternative periodic tables (updated. final, Janet’s left step table is just as good at illustrating the atomic trends as mendeleev’s. the groups are the same. some see the problem with placement of h and he.