Question

161 minutes remaining test content page 24 of 25 question 24 which of these is not an element? a gold b tin c steel d magnesium

Explanation:

Elements are pure substances made of only one type of atom. Gold (Au), tin (Sn), and magnesium (Mg) are elements. Steel is an alloy, a mixture mainly of iron and carbon and other elements.

Answer:

C. steel