How many protons, electrons, and neutrons does 40Ar have?

Argon in the atmosphere has three isotopes, all with 18 protons - but one type (called 36 Ar) has 18 neutrons and a relative mass of approximately 36; a second type (called 38 Ar) has 20 neutrons and a relative mass of approximately 38, and the final and most common type (called 40 Ar) one has 22 neutrons

18 electrons, 18 protons, and 22 neutrons