ELECTRONS IN ATOMS Vocabulary Review Choose the term from the following list that best matches each description. Type the corresponding letter in the space provided. a. quantum f. Hund’s rule b. photons g. atomic emission spectrum c. hertz h. photoelectrons d. Pauli exclusion principle i. Aufbau principle e. wavelength j. quantum mechanical model ___ 1. The lowest-energy arrangement of electrons in a subshell is obtained by putting electrons into separate orbitals of the subshell before pairing electrons.     ___ 2. packets/quanta of electromagnetic energy     ___ 3. the SI unit of frequency     ___ 4. An atomic orbital can hold no more than two electrons.     ___ 5. the amount of energy required to move an electron from its present energy level to the next higher one     ___ 6. the modern description of the location and energy of electrons in an atom     ___ 7. This principle states that electrons enter orbitals of lowest energy first.     ___ 8. the distance between two adjacent crests of an electromagnetic wave     ___ 9. This is produced by passing the light emitted by an element through a prism.     ___ 10. These are sometimes produced when light shines on metals.