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JEE Main Chemistry question

ChemistryStructure of AtomJEE Main

How many of the following species are both isobar and isoelectronic?

Answer: 4

Solution

Electron counts: Te (A=130, ): 52 e; K (A=40, ): 18 e; Xe (A=130, ): 52 e; Ca (A=40, ): 20 e; Ca (A=42, ): 18 e; Ba (A=130, ): 52 e; I (A=130, ): 52 e. Grouping by mass number: the four species with — Te,

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Question ID VK-133007