Chemistry - PERIODIC TABLE Question with Solution | TestHub

Question Explanation: Matching elements with their specific periodic properties. Concept: Periodic Trends and Electronic Configurations. Solution:

Fluorine (F) has the highest electronegativity (4.0) and a negative electron gain enthalpy. Beryllium (Be) has a stable $2{\mathrm{s}}^2$ shell, resulting in positive electron gain enthalpy. Nitrogen ( N ) has a stable half-filled $2p^3$ subshell and positive electron gain enthalpy. Oxygen (O) has a high electronegativity and negative electron gain enthalpy. (P) F - Maximum EN, Negative EGE. (Q) Be - Positive EGE (R) N - Positive EGE, Half filled stability (S) O - Negative EGE Final Answer: Option (1) (P-1,3; Q-2; R-2,4; S-3)