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Which principle is being described?

Exercise and reference answers

Items
  1. Item
    No two electrons share four quantum numbers
    Category
    Pauli
  2. Item
    Caps an orbital at two electrons
    Category
    Pauli
  3. Item
    Fill singly before pairing
    Category
    Hund
  4. Item
    About maximum multiplicity
    Category
    Hund
  5. Item
    Position and velocity cannot both be exact
    Category
    Heisenberg
  6. Item
    Undermines the idea of a definite orbit
    Category
    Heisenberg
Categories
  1. Item
    Pauli
  2. Item
    Hund
  3. Item
    Heisenberg

Explanation

Three named principles govern different things. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.
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