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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

A sudden large jump between the value of first and second ionisation energies of elements would be associated with which of the following electronic configurations? [J & K CET 2004]

Answer: (A)

Solution

Configuration (A) is sodium (), an alkali metal with exactly one valence electron; removing the first electron is easy, but removing the second would mean breaking into the very stable, completely filled (neon) core, requiring a dramatically larger amount of energy — giving a sudden jump between

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Question ID VK-133128