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Limitations of Mendeleev's Periodic Table?

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Limitations of Mendeleev's Periodic Table?

Posted by Keshav Bindal 6 years, 8 months ago

CBSE > Class 10 > Science

6 answers

Keshav Bindal 6 years, 8 months ago

In Mendeleev's Periodic Table also chromium and vanadium's mass is considered wrong in order. But Chromium's mass is 50.2 in Mendeleev's Periodic Table and 52 in modern periodic table. If it's mass is 52 then it is right placed in Mendeleev's Periodic Table..???

Dhanashri Kadam 6 years, 8 months ago

according to Mendeleev arranged the elements in the increasing atomic masses but in the case of Cobalt and Nickel there was a mistake that the atomic mass of Cobalt is 58 .93 the atomic mass of Nickel is 58.71 according to the increasing number of atomic masses Nickel should be placed before Cobalt but it was not so. there were even similar cases such as with the 1.aluminium and silicon 2.venedium and chromium and also there was no any specific the place for hydrogen

Akriti Gupta 6 years, 8 months ago

The position of isotopes could not explained and wrong order of atomic masses of some elements could not explained

Dhanashri Kadam 6 years, 8 months ago

According to Mendeleev ,he arranged the elements according to the increasing number of atomic masses but in the case of Cobalt and Nickel

Khushi Prasad 6 years, 8 months ago

1. Position of hydrogen was not justified. 2. Increasing order of atomic mass could not be maintained. 3. Isotopes have similar chemical properties but different atomic masses, they cannot be given separate places.

Badshah Bhai 6 years, 8 months ago

Position of isotope was not clear and some element work list in wrong order according to their atomic masses like Nickel and Cobalt

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