Question

DRAWBACKS OF DOBEREINER LAW OF TRIADS

DRAWBACKS OF NEWLANDS LAW OF OCTAVE

DRAWBACKS OF MENDELLEnvironmental Sciences PERIODIC TABLE

Answer 1

Here is the answer hope it helps

Answer 2

Doberiner's triad

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•It is not suitable in the all elements group .

It is only applicable for three triads such as Li, Na, K

Cr, Sr, Ba

Cl, Br ,I

Newland's octaves

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•it was found that the law of octaves was applicable only up to calcium . As after calcium every eighth element didnt posses properties as similar to that of first .

•He argued that there are only 56 elements in nature and no more elements would be discovered in the future.

•Inorder to fit elements in his table , Newland adjusted two elents in the same slot , but also put some unlike elements under the same note .

Mendeleev's periodic table

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• He could not able to give a fixed position for hydrogen .

•isotope of all elements posed a challenge to Mendeleev's periodic law.

•He arranged some elements in a way that, against his periodic law