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Practise Identifying Atoms and Molecules in Diagrams

In this worksheet, students will practise spotting the difference between atoms and molecules in diagrams.

'Practise Identifying Atoms and Molecules in Diagrams' worksheet

Key stage:  KS 3

Year:  Year 8 Science worksheets

Curriculum topic:   Chemistry: Atoms, Elements and Compounds

Curriculum subtopic:   Simple Atomic Model

Difficulty level:  

Worksheet Overview

Atoms are the building blocks of all matter. Everything is made up of atoms. And we mean everything!


plastic lego bricks


Even you are made up of atoms! 


Atoms are the simplest particle of an element. Different things are made of different types of atoms. A piece of aluminium for example is made up of lots of aluminium atoms. Nitrogen is made up of nitrogen atoms. 


We can't see individual atoms with the human eye as they are just so small. Even the most powerful microscopes struggle to see them. Even things like bacteria are much bigger than an atom - they are about 10,000 times bigger in fact!


Atoms have a radius of about 1 nanometre.


compass drawing a circle


More than 10 million atoms of hydrogen would be able to fit on a pin head.


a pin


Because we can't easily see atoms we can picture atoms as small balls, and when we draw them we often just draw small circles. Each small circle would represent a single atom. 


a blue sphere


All atoms of the same type would be drawn as the same size and colour circle - they all need to look exactly the same. Atoms from different elements would be drawn as different colours, and maybe even different sizes. So you can easily determine if a picture of a molecule shows just one type of atom or many.


Let's see a molecule of water below:


molecule of water


You can see that the oxygen atom is red and quite big, and the hydrogen atoms are white and a bit smaller. It shows us that water is made up of two types of atom - oxygen and hydrogen. 


But now let's look at gold:


atoms of gold


All of the atoms are identical. The same colour and size. That tells us that gold is made up of only one type of atom. 


Let's find out more by tackling the questions!

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