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The total number of atomic orbitals in fourth energy level of an atom is:

1. 8
2. 16
3. 32
4. 64

Correct answer: 16

Solution

The fourth energy level (n=4) contains orbitals with quantum numbers l = 0, 1, 2, 3 (s, p, d, f). The total number of orbitals is given by n², so 4² = 16.

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