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Question: Answered & Verified by Expert
The statement that is NOT correct is
Chemistryp Block Elements (Group 15, 16, 17 & 18)JEE Main
Options:
  • A Energies of stationary states in hydrogen like atoms is inversely proportional to the square
    of the principal quantum number.
  • B The radius of the first orbit of \( \mathrm{He}^{+} \)is half that of the first orbit of hydrogen atom.
  • C Angular quantum number signifies the shape of the orbital.
  • D Total number of nodes for \( 3 \mathrm{~s} \) orbital is three
Solution:
2524 Upvotes Verified Answer
The correct answer is: Total number of nodes for \( 3 \mathrm{~s} \) orbital is three
The total number of nodes of an orbital is the sum of angular and radial nodes and is given in terms of the $\mathrm{n}$ and $\mathrm{I}$
quantum number by the following equation. Number of nodes $=n-l-1$
for 3 s-orbital, $\mathrm{n}=3$
$\mathrm{I}=0$
Nodes $=3-0-1=2$
Because for s-orbitals, $\mathrm{l}=0$, therefore, there is no angular nodes only radial nodes are present, that is, 2 radial nodes.

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