The possible values for n are 1 to ∞.

The possible values for l are 0 to (n – 1).

The possible values for ml is the range of l: –l to +l.

(a) n = 3, l = 0, ml = -1

l = 0 → possible for n = 3

m_{l} = -1 → not possible for l = 0

not allowed

(b) n = 3, l = 0, ml = -1

l = 0 → possible for n = 3

m_{l} = -1 → not possible for l = 0

not allowed

Tell which of the following combinations of quantum numbers are not allowed. Explain your answers.

(a) n = 3, l = 0, ml = -1

(b) n = 3, l = 0, ml = -1

(c) n = 3, l = 1, ml = 0

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