Question

chuck wants to know how many electrons in an atom are not paired up. which model would be best for chuck to write out?
○ a set of quantum numbers for the last electron in the atom
○ a configuration with numbers, letters, and superscripts
○ a dot structure of the atom
○ an orbital notation of the atom

Explanation:

To determine the number of unpaired electrons in an atom, a dot structure (Lewis dot structure) of the atom is used. Lewis dot structures show the valence electrons, with unpaired electrons represented as single dots. Quantum numbers describe electron energy levels, electron configuration shows electron distribution in orbitals, and orbital notation focuses on orbital filling—none directly show unpaired electrons as clearly as a dot structure.

Answer:

a dot structure of the atom