KCET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)
The statement that is NOT correct is
- 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
Answer & Solution
Correct Answer
(D) Total number of nodes for \( 3 \mathrm{~s} \) orbital is three
Step-by-step Solution
Detailed explanation
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.
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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