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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

The first ionisation energy of lithium will be

Answer: (B)

Solution

IE₁ of Li (520 kJ/mol) is much lower than IE₁ of Be (899 kJ/mol), because Be has a smaller size and a stable, fully-filled 2s² configuration, both of which

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Question ID VK-133267