Question

what is the difference between an element and an atom? how is an isotope related to an atom?

Explanation:

An element is a pure substance made of only one type of atom. An atom is the smallest unit of an element that retains its chemical properties. Isotopes are atoms of the same element with different numbers of neutrons.

Answer:

An element is a pure substance of one - type atoms. An atom is the smallest element unit. Isotopes are same - element atoms with different neutrons.