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When did the world's first periodic table of elements come into being?
One night, Mendeleev worked until the early hours of the morning and went to other places to do business in the morning. "Sir, the carriage to pick you up is already waiting at the door." At about half past six, the servant Anton came into the study and said to him. "Pack my luggage and move it to the car," Mendeleev replied while playing cards. At this time, he seems to have made some progress, but he can't arrange it accurately. He wants to try again. After a while, Anton came in again: "Sir, you must hurry, or you will be late." At Anton's urging, Mendeleev was suddenly inspired. He picked up a piece of white paper and quickly drew it, and quickly arranged the positions of various elements. A few minutes later, a great discovery, the world's first periodic table of elements, was born in this busy morning.