Ions

Ions

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

​Ions

​Ions are atoms or molecules that are charged.

​

​Cations have a positive charge.

​ Gave electrons away.

​

​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.

​

​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.

​

​How to talk about charges

Fill in the Blanks

What is the charge of a strontium ion? 

Fill in the Blanks

What is the charge of a sulfur ion? 

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.

​

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

​

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

​

​Charges

​Li O

​Ionic Formula

​​Li O

​

Fill in the Blanks

What charge does silver have in AgBr?

Fill in the Blanks

What is the formula for the ionic compound of Mg and S?