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The Language of Chemistry

Iron and Copper

Iron usually uses two bonding arms to make compounds but it can sometimes use three.

Likewise, copper usually uses two bonding arms to make compounds but it can sometimes only have one.

This is not a problem because you will always be told how many bonding arms the iron or copper atom is using.

iron II the iron atom is using two bonding arms
iron III the iron atom is using three bonding arms
copper I the copper atom is using one bonding arm
copper II the copper atom is using two bonding arms
   
Atom

Image

Number of Bonding Arms
iron II

2

iron III

3

copper I

1

copper II

2

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