Question

question 15
the number of electron energy levels in an aluminium atom is,
3
2
4
1
5

Explanation:

Aluminium has an atomic number of 13. Its electron configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{1}\). The principal quantum numbers \(n = 1\), \(n=2\), and \(n = 3\) represent the energy levels. So, there are 3 energy levels.

Answer:

3