How many electrons can be found with principal quantum number $n = 3$ in a suitably heavy atom?

Name: How many electrons can be found with principal quantum number $n = 3$ in a suitably heavy atom?
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The principal quantum number $n = 3$ corresponds to the third energy level of an atom. The maximum number of electrons in a given energy level can be calculated using the formula $2n^2$. For $n = 3$, this gives $2(3)^2 = 2(9) = 18$ electrons.

How Many Electrons Can Be Found with Principal Quantum Number n=3n = 3n=3

How Many Electrons Can Be Found with Principal Quantum Number $n = 3$