Argon is a chemical element with the symbol Ar and atomic number 18. It is the third element in Group 18 of the periodic table (noble gases). Argon is colorless, odorless, and tasteless, and is the most abundant noble gas in the atmosphere, at 0.93% by volume.

Here is the information about the number of protons, neutrons, and electrons in argon:

Protons: Argon has 18 protons in its nucleus. The atomic number of an element is equal to the number of protons in its nucleus, so the atomic number of argon is 18.

Neutrons: The number of neutrons in argon can vary between isotopes of argon. The most common isotope of argon is argon-40, which has 22 neutrons. However, other isotopes of argon, such as argon-36, argon-38, and argon-42, have different numbers of neutrons.

Electrons: Since argon is a neutral atom, it has the same number of electrons as protons. Therefore, argon has 18 electrons.

In summary, argon has 18 protons, 22 neutrons (in the case of argon-40), and 18 electrons.