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On his Periodic Table Mendeleev left the blank spaces, because he thought there would be elements that would follow his pattern.
There is no specific reason mentioned for why Dmitri Mendeleev left blank spaces on the periodic table. It is believed that he left these spaces to accommodate elements that were yet to be discovered or to demonstrate the existence of elements with certain properties that were predicted but not yet confirmed. These blank spaces eventually led to the discovery of new elements and validated Mendeleev's periodic table.
Because those elements were not known at the time of Dmitri Mendeleev.
He left blank spaces in the periodic table in the correct grouping and period that is where the newly discovered elements were placed.
Dmitri Mendeleev
There were 3 blank spaces in mendeleev's Periodic Table. He left it for the elements which were not discovered at that time.
On his Periodic Table Mendeleev left the blank spaces, because he thought there would be elements that would follow his pattern.
Mendeleev left blank spaces because certain elements on the Periodic Table were not known at that time. He knew that in the future, those elements would be found and placed on the periodic table.
Mendeleev left 3 blank spaces for the elements that had not yet been discovered.
http://en.wikipedia.org/wiki/Mendeleev%27s_predicted_elements It says he predicted more than three.
There is no specific reason mentioned for why Dmitri Mendeleev left blank spaces on the periodic table. It is believed that he left these spaces to accommodate elements that were yet to be discovered or to demonstrate the existence of elements with certain properties that were predicted but not yet confirmed. These blank spaces eventually led to the discovery of new elements and validated Mendeleev's periodic table.
Because those elements were not known at the time of Dmitri Mendeleev.
Mendeleev thought about the future and realized that it was entirely unlikely that all earthly elements had been discovered, so he left blank spaces in his table and even predicted some of the elements that would fit in those spaces. Surprisingly enough, as time passed, chemists began discovering many of the elements that he had predicted, which fit perfectly into his periodic table.
Because those elements were not known when he formulated his periodic table.
Blank Spaces - 2010 was released on: USA: 22 February 2010 (internet)
He left blank spaces in the periodic table in the correct grouping and period that is where the newly discovered elements were placed.
Paper with spaces