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Answered 2013-01-06 11:38:48

Because those elements were not known when he formulated his periodic table.

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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.



The blank spaces on the earlier periodic table were from elements that had not been discovered yet.


At the time Mendeleev made the periodic table, some elements had not been discovered


Because those elements were not known at the time of Dmitri Mendeleev.


Mendeleev created his periodic table by noticing periodic trends in atomic mass. He noticed that there were some irregularities in his patterns and knew that he was missing some elements.



Mendeleev left spaces for undiscovered elements. He named them eka-aluminium, eka-silicon etc.


mandeleev didn't know spaces in the periodic table because he doesn't arrange it john Kepler arrange it most of mendeleev discoveries of elements are few most of other element where discover by other scientist after him in 19th century


The blank spaces are for undiscovered elements.


Scientists suggest Mendeleev left gaps in the periodic table because Mendeleev knew the elements existed; however, was unable to prove it.


Because germanium was not known at the time when Mendeleev formulated his periodic table.


On his Periodic Table Mendeleev left the blank spaces, because he thought there would be elements that would follow his pattern.


Mendeleev is the inventor of the periodic table of the elements.


Mendeleev left three blank spaces for the elements which were not discovered at that time. Later elements were discovered that fitted into those gaps.


Mendeleev arranged the elements in order of increasing related atomic mass


Because those elements were not discovered at the time Mendeleev proposed the periodic table.



He predicted the elements on the periodic table and left spaces for the undiscovered ones.


In Mendeleev periodic table elements were arranged in the increasing order of their atomic masses and there were free spaces for the new elements which were not discovered at that time. This periodic table had more periods than groups.In Mosley periodic table elements were arranged in the increasing order of their atomic numbers and there were no free spaces for the new elements which were not discovered at that time. This periodic table has more groups than periods.


Because of the periodicity shown by the table Mendeleev knew that new elements would be found to fill in these blank spaces in his nascent table. His predictions were born out fully as element after element was found to fill these empty spaces.


It was recognized by the inventor of the Periodic table that these empty spaces are for elements/isotopes that would be discovered someday. Dmitri Mendeleev is generally credited with the publication, in 1869, of the first widely recognized periodic table. He developed his table to illustrate periodic trends in the properties of the then-known elements. Mendeleev also predicted some properties of then-unknown elements that would be expected to fill gaps in this table.


Mendeleev was the first to make a periodic table and it was published in 1869


Dimtrii Mendeleev made the first Periodic Table. dmitry mendeleev


Dmitri Mendeleev published the periodic table in 1869



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