Q. Who among the following conceived the first recognizable periodic table of chemical elements?
Answer: Dmitri Mendeleev
Notes: The first periodic table which organizes all chemical elements by the number of protons in a given atom and other properties was developed by Russian scientist Dmitry Mendeleev in 1869. On the occasion of the 150th Anniversary of the inception of the periodic table, 2019 is being celebrated as International Year of the Period Table of Chemical Elements by UNESCO.