In this video we'll write the correct formula for Calcium nitride (Ca3N2). To write the formula for Calcium nitride we’ll use the Periodic Table and follow some simple rules.

Keys for Writing Formulas for Binary Ionic Compounds:
1. Write the symbols for each element.
2. Find the charge for each element using the Periodic Table. Write it above each element. For help finding charge, watch: [ Ссылка ] .
3. See if the charges are balanced (if they are you're done!)
4. Add subscripts (if necessary) so the charge for the entire compound is zero.
5. Use the crisscross method to check your work.

Notes:
- Don’t write the subscript '1'.
- If you use the criss-cross method and end up with something like Ca2S2 you'll need to reduce the subscripts to Ca1S1 which we write as CaS.

---Formula Writing Resources---
Finding Ionic Charge: [ Ссылка ]
Memorizing Polyatomic Ions: [ Ссылка ]
Criss-Cross Method: [ Ссылка ]

For a complete tutorial on naming and formula writing for compounds, like Calcium nitride and more, visit:

[ Ссылка ]

Drawing/writing done in InkScape. Screen capture done with Camtasia Studio 8.0

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