The lesson of Ionic compounds

The lesson of Ionic compounds
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  • Huh?What is an Ionic compound?
  • Lisa, give Ms. Williams time to explain first before you ask questions
  • Good morning class, today we will be learning about Ionic compounds.
  • It's okay Mia, Lisa is just confused. An Ionic compound is a compound made up  of ions. Ions are atoms that gain or lose electrons, and by them gaining or losing electrons determines if they have a positive or negative charge. 
  • Wait, Ms. Williams. Ions can have a positive or negative charge?
  • Yes, the elements in the periodic table have charges by groups. For example in group 1 the charge is +1, so every element in group 1 has a charge of + 1, which means the elements lose one electron.
  • Why do they lose 1 electron if the charge is +1?
  • Back to what I was saying. An Ionic compound is a combination of ions. For example, Sodium and Chlorine  combined and created this formula (NaCl) since Na has a charge of +1 and Cl has a charge of _1 they cancel out.
  • They lose 1 electron because the elements want to be stable, so they try to be like the element next to them.
  • Well what if they don't have the same number and cancel out?
  • What do you do in this rule?
  • Good question! If they don't cancel out it's a rule you have to use it's called the criss cross rule.
  • Huh?
  • To find the formula of an Ionic compound that charges don't cancel out, you have to switch the charges.  
  • Oh,Okay I think I'm starting to get it
  • Let me give you and example. Sodium oxide is Na2 O. Na has a charge of+1 and O has a charge _2 so you switch the charges and the formula will be Na2 O. 
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