Electron gain enthalpy () is typically negative (exothermic) for non-metals. For which of the following specific isolated gaseous processes is energy strictly ABSORBED (i.e., is positive)?

Question

Electron gain enthalpy ($\Delta_{eg}H$) is typically negative (exothermic) for non-metals. For which of the following specific isolated gaseous processes is energy strictly ABSORBED (i.e., $\Delta_{eg}H$ is positive)?

Prashant Kotian · Accepted Answer

Correct answer: B,C,D. Process A is exothermic (standard 1st EA). Process B is highly endothermic due to strong inter-electronic electrostatic repulsion when forcing an electron onto an already negative ion. Process C is endothermic because Nitrogen has a stable, exactly half-filled subshell which resists disruption. Process D is endothermic because Neon is a noble gas with a complete octet.

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