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:

• A set of quantum numbers describes properties of one electron, not unpaired electrons.
• Electron configuration (numbers, letters, superscripts) shows electron distribution in shells/subshells but not pairing directly.
• Dot structure (Lewis dot) shows valence electrons but not all unpaired electrons in the atom.
• Orbital notation (using boxes/orbitals and arrows) visually represents electron pairing (arrows) in each orbital, so it’s best to identify unpaired electrons.

Answer:

D. an orbital notation of the atom