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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

The atomic numbers of Ni and Cu are 28 and 29 respectively. The electronic configuration represents

Answer: (A)

Solution

This configuration totals 28 electrons but places all of them in — no electrons at all. Neutral Ni (28 electrons) would instead be arranged as , so

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Question ID VK-132305