Question

derive mendalieve's periodic table .............write the merits n demrits also....(kulkir,chk,my,recent,ans)​

Answer 1

Answer:

ANSWER

Merits of Mendeleev's Periodic Table:

⋅ Mendeleev was first to properly arrange and classify all elements and was able to explain the periodicity in their chemical properties.

⋅ Mendeleev left some gaps for undiscovered elements. He predicted that some elements would be discovered in future. He also predicted properties of those undiscovered elements.

Demerits of Mendeleev's Periodic Table:

⋅ Position of hydrogen was not justified.

⋅ Increasing order of atomic mass could not be maintained throughout the table.

⋅ There is no place for isotopes.

Answer 2

Answer:

MENDLEEV'S PERIODIC TABLE

In Mendeleev’s periodic table, elements were arranged on the basis of the fundamental property, atomic mass, and chemical properties. During Mendeleev’s work, only 63 elements were known. After studying the properties of every element, Mendeleev found that the properties of elements were related to atomic mass in a periodic way. He arranged the elements such that elements with similar properties fell into the same vertical columns on the periodic table.In Mendeleev periodic table, vertical columns in the periodic table and horizontal row in the periodic table were named as groups and period respectively.

According to this observation, he formulated a periodic law which states:

“the properties of elements are the periodic function of their atomic masses.”

Merits of Mendeleev Periodic Table

Some gaps were left for the elements yet to be discovered. Thus, if a certain new element is discovered, it can be placed in a new group without disturbing any existing group.

Demerits of Mendeleev Periodic Table

1. He was unable to locate hydrogen in the periodic table.
2. Increase in atomic mass was not regular while moving from one element to another. Hence, the number of elements yet to be discovered was not predictable.
3. Later on, isotopes of elements were found which violated Mendeleev’s periodic law.

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