Question

1. which of the following diagrams contains a representation of a compound? (circles of different colors or sizes represent atoms of different elements.)

Explanation:

A compound is a substance formed when two or more different elements chemically combine in a fixed ratio. In option (C), there are two different types of atoms (represented by different - colored circles) chemically bonded together (as pairs). Option (A) shows a mixture of an element (the di - atomic molecules on the right) and another substance. Option (B) shows a mixture of atoms. Option (D) shows a single - element (all atoms are of the same type, just different shades which might be a printing error, but in chemical terms, same - sized and - shaped circles represent the same element).

Answer:

C.