The second electron gain enthalpies

CHEMISTRY · Single correct · A Level · Chemistry · Periodicity and periodic trends · Periodicity and periodic trends

Problem

The second electron gain enthalpies, in kJ mol−1\mathrm{kJ\,mol^{-1}}, of oxygen and sulphur, respectively, are (1) −780,+590-780,+590 (2) −590,+780-590,+780 (3) +590,+780+590,+780 (4) +780,+590+780,+590

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