How many orbitals are there in the third principal energy level (n = 3)?
A9CORRECT
B18
C6
D3
JUPEBChemistryAtomic Structure and Periodicity
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Why the answer is A, and why the others tempt you.
The third level has subshells 3s (1 orbital), 3p (3 orbitals) and 3d (5 orbitals), a total of $n^2 = 9$ orbitals. Since each orbital holds 2 electrons, the level holds a maximum of 18 electrons, which is the tempting wrong answer.
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