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NEET 2010 Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesNEET 2010

The correct order of the decreasing ionic radii among the following isoelectronic species is:

Answer: (3)

Solution

(), (), () and () are isoelectronic, each with 18 electrons. For isoelectronic species the ionic radius decreases as the nuclear charge increases, because the same number of electrons is pulled in by a larger

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Question ID VK-090540