Question

Which of the following is not a limitation of Mendeléev's periodic table?

• A. Position of isotopes was not mentioned.
• B. Dissimilar elements were placed together
• C. Elements of group VIII were arranged in three triads but no fixed position was allotted to them
• D. Prediction of new elements was done

Answer 1

The correct option is D Prediction of new elements was done

Mendeléev predicted the existence of some elements that had not been discovered at that time. He named them by prefixing a sanskrit numeral, eka (one) to the name of the preceding element in the same group. Later, scandium, gallium, and germanium were discovered and had properties similar to eka–boron, eka–aluminium and eka–silicon respectively. This was the success of Mendeléev’s periodic table.
Hence, the correct answer is option (d).