MediumChemistryHigh School (9–10)GeneralMetals and Non-metals › Ionic Compounds and Extraction of MetalsNumerical
Find the formula of the compound of aluminium (atomic number 13) and fluorine (atomic number 9).
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Find the formula of the compound of aluminium (atomic number ) and fluorine (atomic number ). Use the arrangement of electrons to find the charges.
Need a reminder? The key ideaShow
A metal atom loses its outer electrons to become a positive ion; a non-metal atom gains electrons to complete eight. The ions attract in an ionic bond, and the charges in the formula cancel. Ionic compounds are hard, brittle crystals with high melting points; they dissolve in water and conduct only when melted or dissolved.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Aluminium loses : .
Step 2. Fluorine gains : .
Step 3. Three balance one : .
Answer: .
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