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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

Ionisation energy of is 217.6 eV compared to that of (54.4 eV). Thus, the atomic number of is

Answer: 4

Solution

For a hydrogen-like (single-electron) species, ionisation energy scales as eV, where is the nuclear charge. For (): eV, matching the given value and confirming the formula. For to also be a

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Question ID VK-133341