Question

Write 5 defects of Morden periodic table !!

Answer 1

5 important ones :

1.Hydrogen resembles both the alkali metals and halogens But it has been placed with the alkalis.

2.The lanthanides and actinides have not been placed in the main body of the table.

3.Place of Multivalent elements is not sure in the modern periodic table.

4. Isotopes were not given separate places in the periodic table although Mendeleev's classification is based on the atomic masses.

5.Some similar elements were grouped separately while some dissimilar elements were grouped together. For example copper and mercury are similar in their properties but were placed separately. Copper was placed in group I although it did not resemble the elements of this group.

Hope it helps!

Please mark brainliest if it does help!