Question

Mendeleeves Perodie law advantages and dis advantages

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Answer 1

Answer:

Advantages:-

1. Mendeleev was the first one to establish a systematic arrangement and bring out the periodicity of properties of elements with atomic weight and propose a periodic law.

2. It could point out the incorrect atomic weight of some elements known at that time.

Disadvantages:-

1. He was unable to locate hydrogen in the periodic table. 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. Later on, isotopes of elements were found which violated Mendeleev's periodic law.

Explanation:

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Answer 2

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♧ Mendeleev Contribution :

1. Systematic study of Chemistry.
2. The discovery of new elements.
3. Correction of atomic Masses.

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● Defects of Mendeleev Period Table:

1. Position of hydrogen.
2. Position of Isotopes.
3. Position of lanthanide and actinides.
4. Variable valency of elements.
5. Anomalous pair of elements.
6. Eight group.
7. Dissimilar elements placed in same group.
8. Similar elements placed in different groups.

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