5. Non-metals (Y7)

What is this definition describing?

"A set number of atoms joined together in a group".

• atom

• molecule

• element

• non-metal

Which of the following substances is a non-metal element?

• lithium

• oxygen

• sodium

• magnesium

What is this definition describing?

"A set number of atoms joined together in a group"

Which of the following diagrams could represent molecules of oxygen (O₂)?

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• 
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• 

Complete the definition for a molecule:

A set number of atoms _________ together in a group

Which of the following diagrams could represent individual atoms of helium (He)?

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• 
• 

Complete the definition of a molecule:

A set number of ________ joined together in a group