JEE Main 2019 — D And F Block Elements Question with Solution
From: JEE Main 2019 (Online) 10th January Evening Slot
Question
The 71st electron of an element X with an atomic number of 71 enters into the orbital :
Choose an option
Show full solutionCorrect option: D
Correct answer
D5d
Step-by-step explanation
In lutetium (71Lu) the 71st electron enters in 5d-orbital.
Electron configuration is [Xe]4f145d16s2
Electron configuration is [Xe]4f145d16s2
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This is a previous-year question from JEE Main 2019, covering the D And F Block Elements chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.