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NEET 2015 Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesNEET 2015

The species Ar, and contain the same number of electrons. In which order do their radii increase ?

Answer: (2)

Solution

Ar, K and Ca are isoelectronic (18 electrons each) with nuclear charges 18, 19 and 20. In an isoelectronic series the radius decreases as the nuclear charge increases, because the same number of

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Question ID VK-091661