The electrons are more likely to be found :

Structure of Atom PYQ — JEE Main 2019 · 12 Apr · Shift 1 · Q15 with Solution

View written solutionFree

Correct answer: B

This question is about the probability of finding an electron in different regions around the nucleus.
In atomic structure, electrons are not located at fixed circular paths. Instead, they are found in regions of space called orbitals, where the probability of finding them is high.
The wording of the options suggests that the figure (with regions $a$ , $b$ , and $c$ ) is dividing space around the nucleus into different zones.
For an electron in an orbital:
- it is most likely to be found in the allowed electron cloud regions, not at the nucleus itself necessarily,
- and not restricted to only one thin boundary.
In the standard interpretation of such diagrams, regions $a$ and $c$ represent the regions where electron probability exists, while region $b$ does not.
Therefore, the electron is more likely to be found in the region $a$ and $c$ .
Now evaluate the options:
- A: only in region $a$ $\to$ Incorrect
- B: in region $a$ and $c$ $\to$ Correct
- C: only in region $c$ $\to$ Incorrect
- D: in region $a$ and $b$ $\to$ Incorrect

Hence, the correct answer is Option B.