We’re being asked todetermine the number of orbitalscontained in thethird major level (n = 3).

You are watching: How many orbitals are contained in the third principal level (n=3) of a given atom?

Recall the thequantum numbersthat specify an electron are:

Principal Quantum Number(n): encounters thesize and also energy the the atomic orbital.

Thepossible values for nare1 to ∞.

Angular momentum Quantum Number(l): deals with theshape of the atom orbital.

Thepossible worths for lare0 come (n – 1).

Magnetic Quantum Number(ml): encounters theorientation the the atom orbitalin 3D space.

Thepossible worths for mlare the variety of l:–l come +l.

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Problem Details

How numerous orbitals are included in the 3rd principal level (n=3) of a offered atom?

A) 7

B) 5

C) 9

D) 3

E) 18

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