When writing the number of electrons gained or lost, should I put the symbol or number first?
Understand the Problem
The question is asking for clarification on the correct notation for indicating the number of electrons gained or lost in a chemical context, particularly whether the symbol (for example, 'e^-') or the number should be mentioned first.
Answer
Write the number first, then the sign: Ba2+, not Ba+2.
The convention in chemistry is to write the number of electrons gained or lost first, followed by the positive or negative sign. For example, the barium cation is written as Ba2+, not Ba+2.
Answer for screen readers
The convention in chemistry is to write the number of electrons gained or lost first, followed by the positive or negative sign. For example, the barium cation is written as Ba2+, not Ba+2.
More Information
This notation is used to clearly indicate the number of electrons involved and the net charge of the ion.
Tips
A common mistake is to write the symbol first, like Ba+2 instead of Ba2+. Ensure you place the number before the sign.
Sources
- 4.7: Ions - Losing and Gaining Electrons - Chemistry LibreTexts - chem.libretexts.org
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