Question

write any two limitation of mendleev s priodic table​

Answer 1

Answer:

hydrogen position is not justified as it was not placed along with alkali

isotopes could not be Accomdated in his periodic table

more than 2 elements was placed in same slot

Answer 2

Answer:

limitations of Mendeleeffs periodic table

1. Anomalous pair of elements: certain elements of highest atomic weights preceded those with lower atomic weights.

For example: tellurium(atomic weight 127.6) preceded iodine(atomic weight 126.9).

2. Dissimilar elements placed together: elements with dissimilar properties were placed in same group as sub-groupA and sub-groupB.

For example: alkali metal like Li, Na, K etc.,of 1A group have little resemblance with coinage metals like Cu, Ag, Au, of 1B group.Cl is of 7A group and 'Mn' is of 7B ,but chlorine is a non metal,where as manganese is a metal