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State 3 limitations of Mendeleeve's Periodic Table

Asked by 17th March 2013, 10:59 AM
Answered by Expert

Limitations are :

Position of hydrogen : Hydrogen is placed in Group IA. However, it actually resembles the elements of Group-IA (alkali metals ) as well as the elements of Group VII-A (halogens ). Thus, the position of hydrogen in the periodic table is not clear.

Position of isotopes : On the basis of atomic weight , various isotopes of the same elements should be assigned different places in the periodic table. Mendeleev could not provide separate places for isotopes.

Position of lanthanides and actinides : Fourteen elements following Lanthanum(known as lanthanides orrare earths) and the fourteen elements following Actinium (known as actinides or transuranic elements ) have not been provided separate and proper places in the Mendellev 's table, rather they have been placed in two rows at the bottom of the table.

Answered by Expert 18th March 2013, 5:37 AM
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