###### Question

How many electrons in an atom could have these sets of quantum numbers?

(a) n=3

(b) n=4, l=2

(c) n=7, l=3, ml=-1

# Solution: How many electrons in an atom could have these sets of quant...

a) All that is given here is the "n" value, which is n=3. This is your shell. When ONLY the "n" value is given, you can use the rule: $2n^2$ to find the total number of electrons. So, $2\text{x} (3)^2$ = 18 electrons in total.

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