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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

The first four ionisation energy values of an element are 191, 578, 872 and 5962 kcal. The number of valence electrons in the element is

Answer: (C)

Solution

The ionisation energies increase gradually from the first to the third value (191 → 578 → 872 kcal) but then jump sharply to 5962 kcal for the fourth. This huge jump indicates that the fourth electron is being removed from a core

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Question ID VK-133320