Group 18 Elements — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Group 18 Elements.

Comparative analysis of physical properties and trends.

high

NEET frequently tests trends across groups. For Group 18, questions comparing boiling points, ionization enthalpies, and atomic radii of different noble gases are very common. Understanding the underlying reasons (London dispersion forces, shielding effect, nuclear charge) is key. For instance, a question might ask to arrange noble gases in increasing order of boiling points or decreasing order of ionization enthalpy. This requires a solid grasp of periodic trends and the factors influencing them.

Structure, hybridization, and geometry of Xenon compounds.

high

The chemistry of Xenon, particularly its fluorides and oxides, is a high-yield topic. Questions involving the determination of hybridization ($sp^3d$, $sp^3d^2$, $sp^3d^3$) and molecular geometry (linear, square planar, distorted octahedral, pyramidal, square pyramidal) using VSEPR theory are almost guaranteed. Students need to be proficient in calculating steric numbers and correctly placing lone pairs to predict shapes. This tests both conceptual understanding and application skills.

Specific uses of individual noble gases and their unique properties.

medium

While not as frequent as trends or Xenon chemistry, questions on the practical applications of noble gases appear regularly. For example, the use of Helium in cryogenics or diving, Neon in discharge lamps, Argon in inert atmospheres, or Radon in radiotherapy are distinct and easily testable facts. These questions often require direct recall and can be quickly answered if the information is memorized.