Final answer:
The isotope of Argon represented as 48 Ar has 18 protons, 18 electrons, and 30 neutrons.
Step-by-step explanation:
The element with the given symbol 48 Ar means it is the isotope of Argon with a mass number of 48. The atomic number of Argon is 18, which tells us that it has 18 protons and, since the atom is neutral, it also has 18 electrons. To find the number of neutrons, we subtract the number of protons from the mass number: 48 - 18 = 30 neutrons. So the correct number of protons, electrons, and neutrons in this isotope of Argon is 18 protons, 18 electrons, and 30 neutrons.