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Example: potassium sulfide, K2S
This compound contain 2 potassium ions and 1 sulfide ion.

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Q: How many K and S2- ions would be in formula unit of the ionic compound formed by these ions?
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How would you determine the difference between an ionic and covalent compound from its chemical formula?

it depends if the formula. it is ionic if the bonds are formed between nonmetal and metals.


What would be the formula and name of the ionic compound formed when potassium reacts with phosphorus?

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