Consider the following elements.

Which of the following is/are true about A^$A^\prime$, B^$B^\prime$, C^$C^\prime$ and D^$D^\prime$? A. Order of atomic radii: B^ < A^ < D^ < C^$B^\prime < A^\prime < D^\prime < C^\prime$ B. Order of metallic character: B^ < A^ < D^ < C^$B^\prime < A^\prime < D^\prime < C^\prime$ C. Size of the element: D^ < C^ < B^ < A^$D^\prime < C^\prime < B^\prime < A^\prime$ D. Order of ionic radii: B⁺ < A⁺ < D⁺ < C⁺$B^{\prime +} < A^{\prime +} < D^{\prime +} < C^{\prime +}$ Choose the correct answer from the options given below:

Core Logic

Electron gain enthalpy (ΔegH$\Delta_{eg}H$) values are considered with their signs when ordering from largest to smallest algebraically.

Arranging these algebraically from highest to lowest: +96 > -200 > -325 > -333$+96 > -200 > -325 > -333$ Thus, Ar > S > Br > F$Ar > S > Br > F$, which corresponds to A > D > B > C$A > D > B > C$.

Pattern Recognition

Noble gases always have positive electron gain enthalpies (highest algebraically). Halogens have highly negative values (lowest algebraically). Fluorine is highly negative, Bromine is slightly less negative. Sulfur sits in between.

Chapter Mix

Class 11 Chemistry: Classification of Elements and Periodicity in Properties