Final answer:
The correct isotopic notation for an atom with 27 protons, 33 neutrons, and 27 electrons is ¹⁶₀Co, which signifies a neutral cobalt atom with a mass number of 60.
Step-by-step explanation:
The correct isotopic notation for an atom with 27 protons, 33 neutrons, and 27 electrons is one that signifies cobalt (Co) because it has an atomic number of 27. The isotopic notation includes the mass number, which is the sum of protons and neutrons, at the top left, the atomic number at the bottom left, and the atomic symbol. Since the mass number is the sum of protons and neutrons, we have 27 (protons) + 33 (neutrons) = 60. Therefore, the correct isotopic notation is ¹⁶₀Co, which is option 'A' among the choices. An atom with an equal number of protons and electrons is electrically neutral.