Question

The maximum number of electrons in an orbit can be calculated by ______ .

• A. n²
• B. n
• C. 2n
• D. 2n²

Answer 1

The correct option is D

2n²

The number of electrons in an orbit is obtained by 2$\times$$n^2$, where n is the number of orbits.

For example: Number of electrons in K shell i.e., in $1^{st}$ orbit can be obtained as follows :-

Here n=1, by using 2$\times$$n^2$ we get maximum number of electrons in K-shell i.e., $1^{st}$ shell = 2.