## General Chemistry

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### Electronic Structure

Question

**8 out of 10**

Which of the following is not a possible set of quantum number values for the nitrogen atom, in the order of principal quantum number, azimuthal quantum number, magnetic quantum number, and spin quantum number?

A | 1, 0, 0, – 1/2 |

B | 2, 1, +1, + 1/2 |

C | 2, 0, 0, – 1/2 |

D | 2, 1, +2, + 1/2 |

**Ans. D**The nitrogen atom has a total of 7 electrons. The principal quantum number could be 1 or 2. With that alone, we cannot rule out any of the choices. The next quantum number given is the azimuthal quantum number, also known as the angular momentum quantum number. The angular momentum quantum number can have values from 0 to

*n*– 1, where n represents the principal quantum number. Since 2 denotes the maximum

*n*value, we cannot rule out any of the choices yet. Look at the next quantum number, which is the magnetic quantum number. The magnetic quantum number can have values from –

*l*to +

*l*, where

*l*represents angular momentum quantum number. So the magnetic quantum number cannot be +2 for nitrogen.

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