The principal quantum number n determines
Correct answer: B. the main energy level and the average distance of the electron from the nucleus
- A. the shape of the orbital
- B. the main energy level and the average distance of the electron from the nucleus
- C. the orientation of the orbital in space
- D. the direction of electron spin
Explanation
The value of n fixes the shell, so a larger n means a higher energy and an electron held further out on average. Shape is set by the azimuthal quantum number l, orientation by the magnetic quantum number m, and spin by s. Knowing which of the four quantum numbers controls which property answers a large family of questions.
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About Quantum Numbers
Quantum numbers describe an electron's energy level, subshell, orbital orientation and spin. You examine the principal, azimuthal, magnetic and spin quantum numbers, their allowed values, orbital capacity and how they determine electronic configurations and distinguish electrons within an atom.
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