How did mendeleev arrange the elements in his periodic table

Asked by admin @ 06/08/2021 in Chemistry viewed by 337 People

How did mendeleev arrange the elements? He left empty places in his periodic table. Why?explain the limitations of mendeleev classification

Answered by admin @ 06/08/2021

Answer:

Mendeleev arranged 63 elements known at that time in order of increasing atomic masses. Whenever a particular element did not fit in the arrangement, he left a gap in the periodic table. Thus, many gaps for undiscovered elements were left in the periodic table by Mendeleev. This helps to a great extension in the discovery of elements in a large scale.

Limitation:

Position of hydrogen :

Electronic configuration of hydrogen resembles that of alkali metal. On the other hand, like halogen it also exist as diatomic molecules. So no fixed position was give to hydrogen.

Position of isotopes:

Isotopes were discovered long after Mendeleev proposed periodic classification of elements.

Anomalous position of some elements:

Although the elements are arranged in terms order of increasing atomic masses, but in some cases, the element with higher atomic mass precedes element with lower atomic mass.

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How did mendeleev arrange the elements in his periodic table

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