Chemistry Atomic Structure MDCAT 2012
PMDC Verified Question 94 of 95
With increase in the value of principal quantum number "\(n\)", the shape of the \(s\) orbitals remains same although their sizes:
A
Decrease
B
Remain the same
C
Increase
D
May or may not remain the same
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Increase
Concept: The principal quantum number \(n\) determines the main energy level (shell) and the distance of the electron from the nucleus.

Formula: $$ \text{Size} \propto n^2 $$

Solution:
  • As the value of \( n \) increases (e.g., \( 1s \rightarrow 2s \rightarrow 3s \)), the electron cloud expands outward.
  • The orbital maintains its spherical shape, but its volume and radius increase significantly.


Why other options are incorrect: Size cannot decrease or remain the same because higher energy shells are physically located further from the nucleus.

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