Main Group Ions

Ions

Learning Target: I can predict ion formation based on periodic trends.

​Ions

​Ions are atoms or molecules that are charged.

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​Cations have a positive charge.

​ Gave electrons away.

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​Anions have a negative charge.

​​ Stole electrons.

Multiple Select

Click on the anions.

• $$Mg^{2+}$$   

• $$F^-$$  

• $$O^{2-}$$  

• $$Na^+$$  

Multiple Select

Click on the cations.

• $$Ca^{2+}$$   

• $$F^-$$  

• $$S^{2-}$$  

• $$Na^+$$  

​Cations

​Atoms of many main-group metals lose enough electrons to leave them with the same number of electrons as an atom of the preceding noble gas.

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​Anions

​Atoms of many main-group metals gain enough electrons to leave them with the same number of electrons as an atom of the following noble gas.

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​How to talk about charges

Ionic and Covalent Bonds

Ionic bonding is the attraction between positively- and negatively-charged ions.

​Covalent bonds are electrons that are shared by two atoms.

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​A compound that contains ions and is held together by ionic bonds is called an ionic compound.

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​We can predict the ionic formula of a compound from the charges.

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​Charges

​Li O

​Ionic Formula

​​Li O

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