Bihar Police Constable Model Paper 4

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Question : 57 of 100

Marks: +1, -0

K-shell is the ___________ energy level.

Fourth
First
Third
Second

Solution:

K-shell is the first energy level.
The electrons are negatively charged particles and their position outside the nucleus depends upon their potential energy level.
Different energy levels are as follows:
- 1st energy level- K shell/orbit
- 2nd energy level- L shell/orbit
- 3rd energy level- M shell/orbit
- 4th energy level- N shell/orbit and so on.

The maximum number of electron present in an orbit is $2n^2$ where n= number of orbit.
Example for K shell maximum electron $2(1)^2$ = 2, for L shell $2(2)^2$ = 8, and so on.
The K shell will have minimum energy as it is near to the center and the outward shell will be of increasing energy.
An electron will first fill the minimum energy because atom with the lowest energy is most stable

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