August 12, 2020, 04:21:27 PM
Forum Rules: Read This Before Posting

### Topic: How many electrons are present in 19F-?  (Read 235 times)

0 Members and 1 Guest are viewing this topic.

#### LuminousNutria

• Very New Member
• Posts: 1
• Mole Snacks: +0/-0
##### How many electrons are present in 19F-?
« 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?

#### Babcock_Hall

• Chemist
• Sr. Member
• Posts: 4234
• Mole Snacks: +265/-17
##### Re: How many electrons are present in 19F-?
« Reply #1 on: July 12, 2020, 10:26:09 PM »
What is the difference between atomic number and mass number?