Quantum Numbers (U1)

7 important questions on Quantum Numbers (U1)

What is Hund's Rule?

  1. ea. orbital in a subshell is singly occupied w/ 1 e- before any one orbital is doubly occupied.
  2. All e-s in singly occupied orbitals have same spin


What is the Aufbau Principle?

assumes/suggests a hypothetical process in which... an atom is "built up" by progressively adding e-s

What is Pauli's Exclusion Principle?

  1. No two e-s in same atom can be in same quantum state, having same #s
  2. ∴ e-s in same orbital must have diff orientation of intrinsic spin, denoted as +1/2 or -1/2
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Describe the 2ndary (Angular) Quantum Number (l) (Arnold Sommerfield) (Notes 2/2)

  • Cc

What does the Magnetic Quantum Number (3rd Quantum Number) Ml do?

  1. Divides ea. Subshell/suborbit into individual orbitals
  2. describes how orbital is oriented in space relative to their subshell

What is Spin Quantum Number (4th Quantum Number) (ms) ?

Magnetic properties of an e- can be explained by rotation of an electric charge

How was the spin quantum number (4th Quantum Number) (ms) discovered? What were the results of the discovery?

  • discovered when a stream of H atoms (only 1 e-) was passed thru a magnetic field
    • beam of H atoms split in 2
    • beam was split ∵ 1/2 went to either pole

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