Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Structure of Atom question

2020 · 2 Sep · Shift 2 · Q18
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /JEE Main
  3. /Chemistry
  4. /Structure of Atom
  5. /2020 · 2 Sep · Shift 2 · Q18

Structure of Atom question

2020 · 2 Sep · Shift 2 · Q18

JEE MainChemistryStructure of AtomMCQ+4 / −1
The number of subshells associated with n = 4 and m = –2 quantum numbers is
  1. A
    8
  2. B
    2
  3. C
    16
  4. D
    4
View written solutionFree

Correct answer: B

  1. For a given principal quantum number n=4n=4n=4, the allowed values of azimuthal quantum number lll are: l=0,1,2,3l=0,1,2,3l=0,1,2,3 These correspond to the subshells: 4s,4p,4d,4f4s, 4p, 4d, 4f4s,4p,4d,4f

  2. The magnetic quantum number mmm (or mlm_lml​) can take values: m=−l,−(l−1),…,0,…,(l−1),lm=-l,-(l-1),\dots,0,\dots,(l-1),lm=−l,−(l−1),…,0,…,(l−1),l We are given: m=−2m=-2m=−2 So we must find which values of lll allow m=−2m=-2m=−2.

  3. Check each possible lll:

  • For l=0l=0l=0: allowed m=0m=0m=0 only d7 not possible
  • For l=1l=1l=1: allowed m=−1,0,1m=-1,0,1m=−1,0,1 d7 not possible
  • For l=2l=2l=2: allowed m=−2,−1,0,1,2m=-2,-1,0,1,2m=−2,−1,0,1,2 3 possible
  • For l=3l=3l=3: allowed m=−3,−2,−1,0,1,2,3m=-3,-2,-1,0,1,2,3m=−3,−2,−1,0,1,2,3 3 possible
  1. Therefore, m=−2m=-2m=−2 is possible for two subshells: l=2⇒4dl=2 \Rightarrow 4dl=2⇒4d l=3⇒4fl=3 \Rightarrow 4fl=3⇒4f

Hence, the number of subshells is: 2\boxed{2}2​

  1. Option check:
  • A: 888 d7
  • B: 222 3
  • C: 161616 d7
  • D: 444 d7

So the correct option is B\boxed{\text{B}}B​.

PreviousNext

More from Structure of Atom

  • The work function of sodium metal is 4.41 × 10–19 J. If photons of wavelength 300 nm are incident on the metal, the kinetic energy of the ejected electrons will be (h = 6.63 × 10–34 J s; c = 3 × 108 m/s) ​…2020 · Numerical
  • Consider the hypothetical situation where the azimuthal quantum number, l, takes values 0, 1, 2, ....., n + 1, where n is the principal quantum number. Then, the element with atomic number :2020 · MCQ
  • The region in the electromagnetic spectrum where the Balmar series lines appear is :2020 · MCQ
  • The shortest wavelength of H atom in the Lyman series is λ 1. The longest wavelength in the Balmar series of He+ is :2020 · MCQ
  • The difference between the radii of 3rd and 4th orbits of Li2+ is R1 . The difference between the radii of 3rd and 4th orbits of He+ is Δ R2 . Ratio Δ R1 : Δ R2 is :2020 · MCQ
  • The correct statement about probability density (except at infinite distance from nucleus) is :2020 · MCQ
  • The number of orbitals associated with quantum number n = 5, ms = +21​ is :2020 · MCQ
  • For the Balmer series in the spectrum of H atom, u=RH​{n12​1​−n22​1​}, the correct statements among (I) to (IV) are : (I) As wavelength decreases, the lines in the series converge…2020 · MCQ