What is the colour of an atom? Since all matter around us is made up of atoms so the colour of all the things around us must be the same. But the world around us is colourful (i.e., different objects have different colours), why is it so?

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Solution

The term "colour" refers to visible light with a certain frequency or a mixture of visible light frequencies. Therefore, the word "colour" describes the frequency content of any type of visible light. Anytime visible light is present, we can describe it as having a certain colour. With this in mind, there are many different ways an object can reflect or emit visible light. Thus, there are many ways an object can "have a colour". While a single, isolated, atom can reflect or emit visible light in several of these ways, it does not participate in all the ways.

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