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He predicted the properties of these elements and left places for them in his chart
Dmitry I. Mendeleyev
Dmitry Ivanovich Mendeleyev
he knew that because of the new elements that were formed and he figured that the atoms would pop back and forth and leave gaps in between them.
Scientists suggest Mendeleev left gaps in the periodic table because Mendeleev knew the elements existed; however, was unable to prove it.
Those gaps were later filled by elements discovered after the creation of the table, which justified the gaps being left for that purpose.
There were gaps in the periodic table a hundred years ago because investigators had not discovered some elements yet, though there was a "place" for them in the array. Recall that through the genius of Mendeleyev, the elements had been given an "order" owing to their chemical properties. By creating a "chart" (the first periodic table), Mendeleyev could see where elements "would be" though none had yet been discovered. He could predict that eventually an element would appear "here" on the table and would have a "these" properties because of the arrangements in the array or table of element.
The periodic table
Dmitry I. Mendeleyev
The Periodic Table was invented by Dmitry Mendeleyev. He grouped every known element and he used this table to predict the existence of other several elements. Mendelevium name pays homage to Dmitry Mendeleyev.
when Mendeleyev changed the layout,there were gaps.how did the gaps help scientists looking for undiscovered elements
Because those elements were not discovered at the time Mendeleev proposed the periodic table.
A secondary phenomenon is knowing something that we did not acquire through knowledge or research.The Russian chemist Dmitri Ivanovich Mendeleev (Dmitry Mendeleyev 1834-1907) had a secondary phenomenon. "In one moment - I know." Mendeleyev developed The Periodic Law based on a vision in a dream. In his dream, he saw elements arranged according to their chemical properties and atomic weight. Dmitry did not see all the elements in his vision. Dmitry Mendeleyev documented the elements that he saw in his Periodic Tableand published it with gaps for elements that were not known at the time. The gaps where filled in years later as they were discovered by other scientist.
Russian chemist Dimitri Mendeleyev.
Dmitry Ivanovich Mendeleyev
Mendeleev left some gaps in his table for the elements which were not discovered at that time.Those elements were later found as silicon,gallium,germanium which were then filled in the gaps
he knew that because of the new elements that were formed and he figured that the atoms would pop back and forth and leave gaps in between them.
He pretty much created/organised the modern Periodic Table.