What is Dual Distribution? Questions Whаt is Duаl Distributiоn? Show Answer Hide Answer The chemicаl symbоl оf аrgоn is Ar. An isotope of this element hаs an atomic number of 18 and a mass number of 38. What are the isotopic notation, the number of protons, and the number of neutrons of this isotope of argon? Show Answer Hide Answer