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2·QUIZLET VOCABULARY: Quantum Numbers Study online at quizlet.com/_k43od 1. Angular Momentum Quantum Number: l Indicates sublevel that electron is in. s - shape: spherical max 2 e p -shape: dumbbell max 6 e d -shape: 4 leaf clover max 10 e f - shape: flower max 14 e 2. Aufbau principal: states that each electron occupies the lowest energy orbital available 3. electron configuration: the arrangement of electrons around nucleus in an atom 4. Hunds rule: orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron, and all electrons in singly occupied orbitals must have the same spin 5. Magnetic (orbital) quantum Number: ml Indicates orientation of orbital in space S- 1 orbital P- 3 orbitals D- 5 orbitals F- 7 orbitals 6. orbital: A 3-D space around the nucleus where an electron is likely (high probability) to be found. 7. pauli exclusion principle: An atomic orbital may describe at most two electrons, each with opposite spin 8. Principle Quantum Number: n Indicates the energy level that electron is located in 9. valence electrons: Electrons in the highest occupied energy level of an element's atoms; determines the chemical properties of an element. To find, look at group # for main group elements. Usually the only electrons involved in chemical reactions. 10. valence shell: Outermost energy level occupied by electrons of an atom.