Fluorine atom in 3D
Fluorides and specialist materials. Fluoride compounds are used in dental care; fluorine is also incorporated into specialist polymers. Explore the 3D model, inspect its parts and learn with guided explanations. Free on Atlas.
What you can learn
Fluorides and specialist materials. Fluoride compounds are used in dental care; fluorine is also incorporated into specialist polymers.
Identify fluorine from its proton count.
Count the neutrons in Fluorine-19.
Inspect the occupied electron shells.
Compare the valence shell with a neighbouring element.
Explain what changes when an electron is lost.
Fluoride ions in toothpaste are chemically different from elemental fluorine gas.
Try an investigation
Identify fluorine from its proton count.
Check your understanding
What identifies an atom as fluorine?
9 protons. Atomic number is proton count. Every fluorine nucleus has 9 protons.
How many neutrons are in Fluorine-19?
10. Neutrons = mass number − atomic number = 19 − 9 = 10. Mass number is not the average atomic weight of natural samples.
How many electrons are in a neutral fluorine atom?
9. A neutral atom balances 9 positive protons with 9 negative electrons.
Which shell count describes neutral fluorine in its ground state?
2, 7. [He] 2s² 2p⁵ gives 2, 7 electrons across its occupied shells. Circular paths are only diagram guides.
If this atom loses one electron, what happens to its net charge?
It becomes +1. Losing one negative electron leaves one more proton than electrons. Its 9 protons still identify it as fluorine.
What can this 3D shell model tell you reliably?
The particle counts for the selected neutral isotope. The counts represent a defined isotope and neutral atom. Particle sizes, spacing and circles are simplified teaching symbols.
Sources and model scope
An educational representation. The explorer identifies its data sources, scale choices and simplifications.