Question

Explain the important achievements and failures of Mendeleev's periodic table.
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Answer 1

Answer:

•important achievements of Mendeleev's periodic table-

• He left spaces for elements not discovered at the time.
• Mendeleev made detailed predictions about the properties of some undiscovered elements, based on the gaps in his periodic table.
• There would be strong support for Mendeleev's table of elements with these properties were found

•failures of Mendeleev's periodic table-

• He was unable to locate hydrogen in the periodic table.
• Increase in atomic mass was not regular while moving from one element to another. Hence, the number of elements yet to be discovered was not predictable. Later on, isotopes of elements were found which violated Mendeleev's periodic law