Question

in one atom, what is the maximum number of electrons that could have the quantum number of n = 3?

Explanation:

Step1: Recall electron - shell formula

The number of electrons in a shell with principal quantum number \(n\) is given by the formula \(2n^{2}\).

Step2: Substitute \(n = 3\) into the formula

When \(n=3\), we calculate \(2n^{2}=2\times3^{2}\).
\[2\times3^{2}=2\times9 = 18\]

Answer:

18