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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I, having atomic number 9, 17, 35 and 53 respectively, is [AIEEE 2011]

Answer: (A)

Solution

Electron gain enthalpy (negative sign, magnitude of energy released) generally decreases down a group as atomic size increases. However, fluorine's very small 2p subshell causes the incoming electron to experience strong repulsion from the existing

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Question ID VK-133173