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| 1. |
What are demerits of mendellevs periodic law |
| Answer» This is demerit of mendeleev periodic table I\'m could not find mendeleev periodic law i/ mendeleev could not assign a correct position to hydrogen in periodic table, as hydrogen resembles alkali metals as well as halogens. 2/ Isotopes had to be given the same position in the periodic table ,through isotopes of the same elements have different atomic masses 3/it was observed that at certain places an element of higher atomic mass Cobalt has been placed before an element of, lower atomic mass Nickel 4/ some placed in the same sub-group varies, in their properties. Manganese is placed with halogens which totally differ in the properties. | |