Completed worksheet on atomic structure with handwritten notes and calculations for carbon-12.
A worksheet titled "Atomic Structure" with handwritten notes and calculations, showing a table with columns for Isotope, Atomic Number, Mass Number, AZ Notation, Number of Protons, Number of Neutrons, and Number of Electrons. The first row is filled out for C-12 with values 6, 12, 6, 6, and 6, with annotations explaining the mass number and atomic number.