Question

select the correct answer from each drop - down menu. william finds a piece of pure iron in his garden. after a few days, the iron begins to rust. what are the two types of substances involved in the rusting process of iron? iron is drop - down 1 with one kind of atom that combines with oxygen from the air to form rust (iron oxide). rust contains two types of atoms, which means it is drop - down 2.

Explanation:

An element is a pure substance made of only one kind of atom. Iron is an element. A compound is a substance made up of two or more different types of atoms chemically combined. Rust (iron oxide) is a compound as it contains iron and oxygen atoms.

Answer:

Iron is an element.
Rust is a compound.