Yes, gold is a pure element.
Gold (Au) is defined as an element with an atomic number of 79. Because it is composed solely of gold atoms, all of which have the same number of protons, gold is classified as a pure substance. Elements, by definition, are pure substances as they consist of only one type of atom. This contrasts with compounds, which are composed of multiple elements chemically bonded together.
Essentially, a pure substance is a material that has a consistent composition throughout. Elements and compounds fall into this category. Gold, being an element, fits this definition perfectly. Any sample of pure gold will contain only gold atoms, and its properties will be consistent throughout the sample.
