How did mendeleev arrange the elements? He left empty places in his periodic table. Why?explain the limitations of mendeleev classification
Answers
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.
Pls mark it as the brainliest!!
Answer:
Explanation:
he arranged the elements in horizontal rows and vertical column of a table in order of their increasing atomic weight in such a way the elements similar properties occupy the same vertical column or group
he left empty places so that he can place the predicted elements which were not discovered like eka aluminium (gallium) and eka silicon (germanium).
limitations : the physical and chemical properties of elements are periodic function of their atomic number
➡ Position of Hydrogen => Position of hydrogen in the periodic table is Uncertain , Because hydrogen is placed in 1 A group with Alkali metals .
➡ Position of isotopes => isotopes haven't been given separate place in periodic table .
➡ Cause of periodicity => Mendeleev could not explain the cause of periodicity .
➡ Separation of similar elements => some dissimilar elements have been placed together .