Because those elements were not known at the time of Dmitri Mendeleev.
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 the properties of known elements
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.
Dmitri Mendeleev's periodic table allowed for the prediction of undiscovered elements based on the patterns of known elements. He arranged elements by increasing atomic mass and grouped them by similar chemical properties, which led him to leave gaps for elements he anticipated would be found later. For instance, he predicted the existence of gallium and germanium before they were discovered, as their properties aligned with the trends of elements in their respective groups. His periodic table's structure demonstrated that elements exhibit periodicity, enabling accurate predictions about their characteristics.
Mendeleev left spaces for undiscovered elements. He named them eka-aluminium, eka-silicon etc.
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
Mendeleev left blank spaces in his periodic table to account for elements that had not yet been discovered. He predicted the properties of these missing elements based on the patterns he observed in the table. This empty spaces allowed for the periodic table to be a predictive tool for the discovery of new elements.
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.
One.
Mendeleev left gaps for eight elements in his periodic table that were yet to be discovered. These gaps eventually corresponded to the elements gallium, germanium, scandium, technetium, francium, and technetium.
I believed you are referring to Dmitri Mendeleev. He left blank space because he was able to deduce a pattern between the chemical properties of the elements an their atomic weights. He also noticed gaps in this pattern and hypothesized correctly that these blank spots corresponded to elements that had not yet been discovered.
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.
The first periodic table by Dmitri Mendeleev did not account for the discovery of isotopes (elements with the same number of protons but different number of neutrons) and did not leave spaces for later-discovered elements. Additionally, it did not show the relationship between atomic number and chemical properties.
Because those elements were not known when he formulated his periodic table.
Gallium, Silicon and Aluminum , -Peter
because they do not leave blank spaces and they take their time to make it like real life.