When Mendeleev proposed his Periodic Table, he noted gaps in the table, and ... Initial versions of the periodic table did not give the rare earth elements the ... that these atomic elements would be discovered, that he included them in later.
Leaving spaces and gaps in the periodic table allowed for prediction of new elements and their properties, which were later discovered and filled in. This vindicated the decision to leave gaps, as it demonstrated the power of the periodic table in organizing and predicting the properties of elements.
The gaps were left for elements which were not discovered at that time. The properties which were estimated for the elements at that time was same as found later in those elements.
Dmitri Mendeleev predicted the existence and properties of several elements that were later discovered and filled gaps in the periodic table. He also predicted the properties of these elements based on their position in the periodic table.
Mendeleev left those gaps for the elements which were not discovered at that time. He named those elements like eka-aluminium,eka -silicon etc.
He predicted that elements with the predicted properties would be discovered to fill in these gaps.
Scientists suggest Mendeleev left gaps in the periodic table because Mendeleev knew the elements existed; however, was unable to prove it.
The gaps in the periodic table left by Mendeleev were eventually filled in as new elements were discovered. Scientists continued to study and experiment, leading to the discovery and verification of elements that fit into the empty spaces in the periodic table.
Medellev left gaps in the periodic table to account for elements that had not yet been discovered. He predicted the properties of these missing elements based on the known trends and patterns in the table. This foresight and organization laid the groundwork for the future discovery of elements that filled those gaps.
Because at that time there were no known elements to fill those gaps. The fact that they were filled indicated the power of his classification method. When a scientific theory predicts things clearly and these are later found, the theory becomes validated.
The gaps in the periodic table provided a framework for scientists to predict the properties of undiscovered elements based on the trends and patterns observed in the known elements. By identifying missing elements in the periodic table, scientists were able to focus their search on regions where certain properties were expected based on the elements surrounding the gaps. This guided experimental efforts to discover and synthesize new elements.
The gaps represented the elements which were not discovered. When the elements were invented, they were placed into these gaps.
Mendeleev predicted that there would be three additional elements to be discovered based on the gaps in his periodic table at the time. These elements turned out to be later discovered and were named gallium, scandium, and germanium.