Question

write two limitations of mendeleev classification​

Answer 1

1) position of hydrogen= hydrogen resembles both with halogens as well as alkali metals. it forms the positive ions like metals and negative ions like halogens. so position of hydrogen was not justified.

2) position of isotopes= position of isotopes could not be explained there was no space for isotopes although they different atomic masses.

3) wrong water order of atomic masses of some elements as mentally has place the elements in increasing order of atomic masses but Cobalt is placed before nikal to measure chemical property of the group this anomaly was not explained by mendleev.

4) similar elements in different groups and some elements with similar properties have been placed in different groups were placed.

5) cause of periodicity is not explained it was not explained that why the elements of same group show resemblance in their properties.

Answer 2

Answer:

1)place of hydrogen is not defined

2)elements having same atomic mass are placed incorrectly

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