Question

Arrange the following principal quantum numbers of the orbitals in increasing order of energy.

• A. n = 1
• B. n = 2
• C. n = 3
• D. n = 4

Answer 1

An electron in an orbital is represented by four quantum number.
$\bullet$ Principal quantum number
$\bullet$ Angular quantum number
$\bullet$ Magnetic quantum number
$\bullet$ Spin quantum number

Where 'n' represents principal quantum number.

The energy of an electron in an orbit is given by:

${\text{E}}_n$=$-2.18\times {10}^{-18}\left({\frac{1}{n}}^2\right)$ J


Thus, as the value of n increases the energy also increases.