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At the time the Periodic Table was first devised, there were many elements that had not yet been discovered. Their existence could be inferred, but they couldn't actually be put into the table until they were discovered.
When the periodic table was first devised, there were lots of elements that had not been discovered yet.

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βˆ™ 12y ago
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βˆ™ 13y ago

Because these elements were not known on the date of elaboration of the periodic table.

Ex:

Eka(under)-aluminum: Gallium Eka(under)-Silicon: Germanium

and because of the fact that poodles have hair and people shave it off for some

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βˆ™ 9y ago

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.

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βˆ™ 13y ago

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

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βˆ™ 14y ago

because there is still some undiscovered elements but theorically they are present

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βˆ™ 9y ago

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

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Anonymous

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βˆ™ 3y ago

because he was a brat

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Q: Why did Mendeleev leave blanks in his early version of the periodic table?
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Related questions

Who developed an early periodic chart?

Dmitri Mendeleev


What did Dmitri Mendeleev do?

dimitri mendeleev was the father of the periodic table of elements


What is the important work of dmitr mendeleev?

he invented an early version of the periodic table, and was able to use it to predict what unfound elements properties would be he follow the periodic law and place the similar elements according their mass number.


What did Mendeleevs periodic table look like?

It looks the same as it did when Mendeleev created it. There are no changes made to the table throughout the years because Mendeleev had predicted the correct placement for all of our current known elements.


Did a Russian the early periodic table?

The arrangement of chemical elements into the widely recognised periodic table was first devised by the Russian chemist Dimitri Mendeleev.


How did chemists change Mendeleev's periodic table in early 1900s?

They used atomic number instead of Atomic Mass to organize the elements.


Why were there some blanks left in the early periodic table?

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What year was the periodic table published in?

The first slightly inaccurate Periodic Table of Elements was invented in the mid 1800's. Then Henry Mosley found the mistakes and re-corrected them in the early 1900's, which now is our current periodic table that we use.


Maxwell a Russian scientist created an early periodic table of elements?

Dmitri Mendeleev was the Russian chemist who developed the periodic table of elements. He accomplished most of his work during the 1860s. In 1869, he invented a method of arranging the elements that were known at that time in order of their atomic weights.


What did Dmitri MendelΓ©ev discover?

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Who is Dmitri Mendeleev?

He proposed one of the early versions of the Periodic Table. He arranged the elements in the increasing order of their increasing Atomic Mass and repeating properties.


Who created an early periodic table of elements?

This is from wikipedia: Although precursors to this table exist, its invention is generally credited to Russian chemist Dmitri Mendeleev in 1869, who intended the table to illustrate recurring ("periodic") trends in the properties of the elements.