Mendeleev's Periodic Law — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Mendeleev's Periodic Law.

Application of Mendeleev's correction of atomic mass for a less common element.

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While Beryllium is the most common example, NEET could introduce other elements whose atomic masses were corrected by Mendeleev, such as Indium or Uranium. A question might provide initial data and ask to deduce the corrected atomic mass or identify the element based on its predicted properties and group placement. This tests a deeper understanding of the 'correction of doubtful atomic masses' merit beyond rote memorization of Beryllium.

Scenario-based question involving the discovery of a new element fitting Mendeleev's predictions.

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Instead of directly asking 'Which element was Eka-aluminium?', a question might describe the discovery of a new element with properties (e.g., atomic mass, density, oxide formula) that closely match Mendeleev's predictions for a specific 'Eka-element'. Students would then need to identify the predicted element (e.g., Eka-silicon) or its modern counterpart (Germanium) based on the given properties. This tests application and analytical skills rather than just direct recall.

Detailed comparison of the 'cause of periodicity' between Mendeleev's and Modern Periodic Law.

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While the fundamental basis (atomic mass vs. atomic number) is commonly tested, a more nuanced question could delve into *why* periodicity occurs. Mendeleev observed it but couldn't explain it. The Modern Periodic Law explains it through electronic configuration. A question could ask to differentiate between the two laws based on their explanation for periodicity, requiring a deeper conceptual understanding beyond just the defining parameter.