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Why did chemists in 1869 not agree with Mendeleev's periodic table?
Wiki User
∙ 10y ago
Verified answer
Everything. LoL, it was made by a female.
Wiki User
∙ 11y ago
Wiki User
∙ 13y agoThe position of hydrogen was not correctly defined. It was placed in Group I although its properties resembled both the Group I elements (the alkali metals) and the group VII elements (the halogens).
In some cases Mendeleev placed elements according to their similarities in properties and not in increasing order of their atomic masses, while some dissimilar elements were grouped together. Thus, the position of these elements was not justified. For example, cobalt (at. mass 58.9) was placed before nickel (at. mass 58.6); copper and Mercury are similar in their properties but were placed separately. Copper was placed in group I although it did not resemble the elements of this group.
In certain pairs of elements like, Ar (40) and K (39); Co (58.9) and Ni (58.6); Te (127.6) and I (126.9) the arrangement was not justified. For example, argon was placed before potassium whereas its Atomic Mass is more than potassium.
Isotopes are atoms of the same element having different atomic mass but same atomic number. For e.g., there are three isotopes of hydrogen with atomic mass 1, 2, and 3. According to Mendeleev's Periodic Table these should be placed at three separate places. However isotopes have not been given separate places in the periodic table.
Fourteen elements that follow lanthanum called lanthanides and fourteen elements following actinium called actinides were not given proper places in Mendeleev's periodic table.
Wiki User
∙ 9y agoThere were few drawbacks in his table. The isotopes also posed problem.
Anonymous
Wiki User
∙ 14y agoHe left too many spaces between the elements......
Wiki User
∙ 12y agoBecause the people back then couldn't identify protons they were organized by atomic weight to hydrogen the lightest element.
Hope this helps!
Wiki User
∙ 7y agoThey had a conservative thinking, they were envious for this discovery and they are not too smart.
Wiki User
∙ 13y agohe left to match place for elements
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Anonymous
There were no spaces left for elements which were yet to be found.
Mendeleevs periodic table of elements was created in 1901?
Mendeleev's periodic table of elements certainly wasn't created in 1901
What period is Pb in?
How have chemists used the Periodic Table over time
How do chemists organize information about elements?
By grouping the elements on the Periodic Table.
How did chemists organize the elements that were known?
Chemical elements are organized in the periodic table of Mendeleev.
Is the periodic table often referred to as the chemists?
the answer is calendar
How was mendeleevs periodic table like todays periodic table?
it has elements
Why the improvement in Mendeleevs periodic table was made?
To understand the concept of Periodic Table
How did later chemists change Mendeleevs periodic table?
They used atomic number instead of Atomic Mass to organize the elements
What type of scientists made the periodic table?
Chemists....
Mendeleevs periodic table of elements was created in 1901?
Mendeleev's periodic table of elements certainly wasn't created in 1901
Main idea of mendeleevs first periodic table?
In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses and repeating periodic properties.
Who uses the periodic table today?
Chemists
Why is the periodic table so valuablee for chemists?
Periodic table group elements with similar properties together. It makes study of elements easier for chemists.
What period is Pb in?
How have chemists used the Periodic Table over time
What were mendeleevs discoveries and predictions and discoveries abot the periodic table?
Mendeleev predicted that properties of elements are periodic function of atomic mass. He demonstrated it by creating a table.
How do chemists organize information about elements?
By grouping the elements on the Periodic Table.
What is one problem that chemists in about 1800 had to solve before the periodic table?
What to use instead of the periodic table.
