NEET 2007 Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesNEET 2007

With which of the following configuration an atom has the lowest ionization enthalpy?

Answer: (4)

Solution

Ionization enthalpy is lowest for the electron that is held least tightly, i.e. the one that is farthest from the nucleus and best shielded. The configuration is an excited state of neon in which one electron has been promoted to the 3s orbital; this electron is in a higher shell and is easily

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Question ID VK-089835