Naming Ions and Writing Formulas Lesson

Naming Compounds Lesson

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Positive Ions

• Atoms LOSE electrons

• Name stays the same, add the word "ion" to the end

• ALL metals

• Sometimes hydrogen

Negative Ions

• Atoms GAIN (steal) electrons

• Non-metals

• Drop the end of the name and add "-ide"

• 
  

• 
  

• 
  

• 
  

Negative Ions

Copy these down onto your chemistry squad

• arsenide bromide

• carbide chloride

• fluoride hydride

• iodide nitride

• oxide phosphide

• selenide sulfide

Writing Ion formulas

• Write the element symbol

• Look up or figure out the charge and write it down

• Usually written as a superscript but we're not going to worry about that here - just put a space between the symbol and the charge

• example: Lithium ion Li +1

• example bromide Br -1

Reminder about symbols

• first letter MUST be capitalized

• If there is a second letter, it is NEVER capitalized

• You must give either + or -

• You must give the number of the charge

• Leave a space between the symbol and the charge - that's just to make it easier for me to see