![Page 1: Here’s another example of writing the formula for an ionic compound](https://reader036.vdocument.in/reader036/viewer/2022082518/5697bfd01a28abf838caa576/html5/thumbnails/1.jpg)
Here’s another example of writing the formula for an ionic compound.
Writing Formulas for Binary Ionic CompoundsExample 5
![Page 2: Here’s another example of writing the formula for an ionic compound](https://reader036.vdocument.in/reader036/viewer/2022082518/5697bfd01a28abf838caa576/html5/thumbnails/2.jpg)
In this example, we’re asked to write the formula for the compound barium selenide.
Ca2+ P3–
F–Ca2+
Ca2+
+2 –3Ca3P2
P3–
Write the formula for the compound barium selenide.
![Page 3: Here’s another example of writing the formula for an ionic compound](https://reader036.vdocument.in/reader036/viewer/2022082518/5697bfd01a28abf838caa576/html5/thumbnails/3.jpg)
We find the elements on the periodic table. We see that barium is a metal whose ion has a charge of positive 2
Write the formula for the compound barium selenide.
![Page 4: Here’s another example of writing the formula for an ionic compound](https://reader036.vdocument.in/reader036/viewer/2022082518/5697bfd01a28abf838caa576/html5/thumbnails/4.jpg)
We find an element that sounds like selenide but doesn’t end in –ide.
Write the formula for the compound barium selenide.
![Page 5: Here’s another example of writing the formula for an ionic compound](https://reader036.vdocument.in/reader036/viewer/2022082518/5697bfd01a28abf838caa576/html5/thumbnails/5.jpg)
It is the non-metal selenium, whose ion has a charge of negative 2.
Write the formula for the compound barium selenide.
![Page 6: Here’s another example of writing the formula for an ionic compound](https://reader036.vdocument.in/reader036/viewer/2022082518/5697bfd01a28abf838caa576/html5/thumbnails/6.jpg)
This compound contains the ions Ba two plus and Se 2 minus.
Write the formula for the compound barium selenide.
Ba2+ Se2–
![Page 7: Here’s another example of writing the formula for an ionic compound](https://reader036.vdocument.in/reader036/viewer/2022082518/5697bfd01a28abf838caa576/html5/thumbnails/7.jpg)
With one barium ion and one selenide ion, the total positive charge is positive 2 and the total negative charge is negative 2.
Write the formula for the compound barium selenide.
Ba2+ Se2–
+2 –2Total Positive Charge
Total Negative Charge
![Page 8: Here’s another example of writing the formula for an ionic compound](https://reader036.vdocument.in/reader036/viewer/2022082518/5697bfd01a28abf838caa576/html5/thumbnails/8.jpg)
The two charges positive 2 and negative 2 are balanced already. They do add up to zero.
Write the formula for the compound barium selenide.
Ba2+ Se2–
+2 –2Total Positive Charge
Total Negative Charge
These DO add up to zero
![Page 9: Here’s another example of writing the formula for an ionic compound](https://reader036.vdocument.in/reader036/viewer/2022082518/5697bfd01a28abf838caa576/html5/thumbnails/9.jpg)
One barium ion will simplycombine with one selenide ion and result in the formula BaSe.
Write the formula for the compound barium selenide.
Ba2+ Se2–
+2 –2
BaSe
![Page 10: Here’s another example of writing the formula for an ionic compound](https://reader036.vdocument.in/reader036/viewer/2022082518/5697bfd01a28abf838caa576/html5/thumbnails/10.jpg)
Write the formula for the compound barium selenide.
Ba2+ Se2–
+2 –2
BaSeWe’ve now answered the question, the formula for barium selenide is simply BaSe, with no subscripts Again, we see that no charges are written in the final formula for a compound.
Formula: