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Smthng ....... , asked a question
Subject: Science , asked on 10/1/11

Merits and dimerits of Mendeleev's periodic table.

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D#ruv $@xen@ , added an answer, on 11/1/11
42 helpful votes in Science

 Merits -

1. He could classify all the 63 elements known at that time on the basis of similarities in properties.

2. He left gaps for the elements yet to be discovered.

3. He predicted the properties of those yet to be discovered elements and thus, helped in the discovery of other elements later on.

4. He named these elements by prefixing a sanskrit numeral 'Eka' (one), 'Divi' (two), 'Tri' (three), etc.to the names of the preceding preceding similar element in the same group. For example : eka - boron, eka - aluminium, eka - silicon, divi - manganese, eka - tantulum, etc.

  All these elements were discovered later and did have the properties similar to those predicted by mendeleev. For example -

PROPERTIES  EKA - ALUMINIUM                                     GALLIUM

Atomic mass  68  69.7

Formula of oxide  E2O3  Ga2O3

Formula of chloride  ECL3  GaCl3

Demerits -

1. Although most of the elements were placed in the order of increasing atomic weights but this increasing order could not be maintained in all cases. For example - Cobalt atomic mass is 58.93u preceded Nickel 58.71u preceded Tellurium 127.6 preceded Iodine 126.90, thus he couldnt maintain similarities in properties.

2. Mendeleev periodic table did not provide space for noble gases which were discovered later.

3. Moreover there was no space left for isotopes in medeleev's periodic table.

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Aadith Sdas , added an answer, on 4/1/12
4 unhelpful votes in Science

 demerits 

mendeleevs attempt was to arrange the elemets in order of atomic masses at rhe same time placing the elements with similar properties in the same groups

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Aadith Sdas , added an answer, on 4/1/12
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 meneleevees periodic table didnot give space to noblegases

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Aadith Sdas , added an answer, on 4/1/12
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thanku for the this i got some information adout periodic table

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Smthng ....... , added an answer, on 10/1/11
99 helpful votes in Science

Thankx a lot dhru -thumps up der!!!!!!!

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