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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: LuminousNutria on July 12, 2020, 07:48:46 PM

Title: How many electrons are present in 19F-?
Post by: LuminousNutria on July 12, 2020, 07:48:46 PM

I'm in an elementary Biology class. I have an online worksheet that is asking me "How many electrons would be present in ¹⁹F^-?"
My assumption was that the 19 represented the atomic number, and therefore the amount of protons in the element. Since the amount of protons would be 19, I would need at least twenty electrons to have a negatively charged element. However, the highest possible answer was 14. So, I'm obviously making some false assumptions here.

What does ¹⁹F^- represent, and how can I derive the amount of electrons from it?

Title: Re: How many electrons are present in 19F-?
Post by: Babcock_Hall on July 12, 2020, 10:26:09 PM

What is the difference between atomic number and mass number?