What is the number of values that an electron spin quantum number has?

  1. two
  2. zero
  3. four
  4. infinite

Answer (Detailed Solution Below)

Option 1 : two
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The correct answer is two.

CONCEPT:

  • Spin quantum number: The spin quantum number describes the angular momentum and direction of the spin of an electron in the orbital.
    • Each orbital can will hold two electrons. The two electrons will have +1/2 and -1/2 spin.
    • The electrons tend to fill the orbitals before they pair up.
    • Hence, the first electron filled in the orbital will have a spin of +1/2. The electrons start pairing up once all the orbitals are half-filled by one electron each.
    • The second electron to fill the orbital will have a spin of -1/2.

EXPLANATION:

  • The spin quantum number is used to determine the orientation of the spin of the electron i.e. either a spin up or spin down.
  • This orientation is referred to with +1/2 for a spin up and -1/2 for spin down.
  • Hence, an electron spin quantum number can have only two values.
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