JEE Main 2022 — Structure Of Atom Question with Solution
From: JEE Main 2022 (Online) 29th June Morning Shift
Question
Which of the following statements are correct?
(A) The electronic configuration of Cr is [Ar] 3d5 4s1.
(B) The magnetic quantum number may have a negative value.
(C) In the ground state of an atom, the orbitals are filled in order of their increasing energies.
(D) The total number of nodes are given by n 2.
Choose the most appropriate answer from the options given below :
Choose an option
Show full solutionCorrect option: D
Step-by-step explanation
(A) Cr (24) = 1s2 2s2 2p6 3s2 3p6 3d5 4s1
= [Ar] 3d5 4s1
(B) Magnetic quantum number (m) values ranging from l to + l including zero.
It can have negative value.
(C) According to Aufbau rule, electrons are filled first in these orbitals which have low energy.
Statement C is correct.
(D) We know,
Number of Radial nodes = n l 1
and number of Angular nodes = l
Total nodes = n l 1 + 1 = n 1
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This is a previous-year question from JEE Main 2022, covering the Structure Of Atom 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.