Question

how is a compound different from an element at the microscopic level? a) a compound contains only one type of atom. b) a compound is made of atoms chemically bonded from different elements. c) an element is made of molecules from different atoms. d) an element always contains more than one atom.

Explanation:

• Option A: A compound is made of two or more different types of atoms (elements) chemically bonded, so A is incorrect.
• Option B: By definition, a compound is a substance formed when two or more different elements are chemically bonded together. This correctly distinguishes a compound from an element (which consists of only one type of atom).
• Option C: An element is made of only one type of atom (either as single atoms or molecules of the same atom, like \(O_2\) for oxygen), not different atoms. So C is incorrect.
• Option D: An element can exist as single atoms (e.g., noble gases like helium, He) or molecules of the same atom (e.g., \(O_2\)), so it doesn't always contain more than one atom. D is incorrect.

Answer:

B) A compound is made of atoms chemically bonded from different elements.