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Identify Atoms and Molecules in Diagrams

In this worksheet, students will practise identifying atoms and molecules from diagrams.

'Identify Atoms and Molecules in Diagrams' worksheet

Key stage:  KS 3

Year:  Year 7 Science worksheets

Curriculum topic:   Chemistry: Atoms, Elements and Compounds

Curriculum subtopic:   Simple Atomic Model

Difficulty level:  

Worksheet Overview

What do you think you're made of?


girl thinking


You are made up of atoms! In fact, everything is made of atoms.


Atoms are the simplest particle of an element. Different things are made of different types of atoms. A piece of gold for example is made up of lots of gold atoms. Oxygen is made up of oxygen atoms. 


We can't see individual atoms with the human eye as they are just so small. Only the most powerful microscopes can see them.

Atoms have a radius of about one nanometre. Let's try and visualise that ...... picture a centimetre on a ruler. How many atoms do you think would need to be lined up in a row to stretch that centimetre?


centimetre ruler


 Ready for it.......... 100,000,000! 


Because we can't easily see atoms (without the use of a very powerful microscope!) 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. 


blue sphere


All atoms of the same type would be drawn as the same size and colour circle. 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 have a look at this in some more detail!

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