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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

The order of first ionisation energies of the element Li, Be, B, Na is [Kerala CEE 2005]

Answer: (B)

Solution

Approximate values (kJ/mol): Be = 899, B = 801, Li = 520, Na = 496. Be's completely filled subshell gives it the highest IE of the four, followed by B (also period 2), and then

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Question ID VK-133181