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## Homework Statement

If elements with principal quantum number n > 4 were not allowed in nature, the number of possible elements would be

(A) 60

(B) 32

(C) 4

(D) 64

## Homework Equations

## The Attempt at a Solution

I got 36 from the periodic table (2+8+8+18)

However, that isn't even an option. The answer is 60. Please help.