Science, asked by 1DisLife, 11 months ago

differentiate between mendeleev periodic table & modern periodic table

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Answered by ShivamKashyap08

Answer:

Mendeleev's periodic table:

it has 8 groups and 6 periods.

transition elements are not separated.

inert gases were not present.

lanthanides and actinides were not present.

group number and period number cannot be predicted.

elements are arranged according to the atomic mass.

Modern periodic table :

it has 18 groups and 7 periods

transition element are given separate place

the inert gases are present in separate group

lanthanides and actinides are the bottom of periodic table

group number and period number can be predicted from its electronic configuration

elements are arranged according to the atomic number.

Hope it helps.

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Answered by Anonymous

Answer:

$<html><body><table style="width:400%"> <tr> <td> Mendeleev's periodic table</td> <td>Elements were arranged in increasing order of atomic masses.</td> <td> There are 8 groups.</td> <td>Each group is divided into subgroups a and b.</td> <td>The group for noble gases was not present, as noble gases were not discovered at that time.</td> <td> There was no place for isotopes.</td> </tr><tr> <h3> <td> Modern periodic table</td></h3> <td> Elements are arranged in increasing order of atomic numbers.</td> <td>There are 18 groups</td> <td> Groups are not divided into subgroups.</td> <td> A separate group, i.e. group 18 is present for noble gases.</td> <td> 5. This problem was rectified, as slots are determined on the basis of atomic number.</td> </tr></table></body></html> >$

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