According to NCERT Book…1. No fixed position can be given to hydrogen in the periodic table.2. The atomic masses don\’t increase in a regular manner in going from one element to the next.3. It was not possible to predict how many elements could be discovered between two elements-especially when we take heavier elements.
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Limitations of Mendeleev’s periodic table: ✿Elements with large difference in properties were included in the same group. Eg: Hard metals like copper (Cu) and silver (Ag) were included along with soft metals like sodium (Na) and potassium (K). ✿No proper position could be given to the element hydrogen. Non-metallic hydrogen was placed along with metals like lithium (Li), sodium (Na) and potassium (K). ✿The increasing order of atomic mass was not strictly followed throughout. Eg. Co & Ni, Te &I. ✿No place for isotopes in the periodic table.
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