What is the maximum number of electrons allowed in the third energy level

The maximum number of electron in the first energy level (n = 1) is 2 (1) 2 = 2 electrons. The maximum number of electron in the second energy level (n = 2) is 2 (2) 2 = 8 electrons. The maximum number of electron in the third energy level (n = 3) is 2 (3) 2 = 18 electrons ... etc ...

18 electrons allowed in the 3rd energy level