In Figure 2.4, what is the total number of electrons that can occupy the n= 3 level? *
3
6
9
18

18

Explanation:

The n - level given is 3

To find the number electrons that can occupy this level, we use:

                2n²  

n - is the energy level.

The energy level here is 3;

            2 x 3²   = 18

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