At what ratio will potassium and sulfur form a binary ionic compound?

Explanation:

Atomic number of potassium is 19 and its electronic distribution is 2, 8, 8, 1.  

Hence, in order to become stable in nature it will lose its one valence electron. Therefore, neutral potassium atom will change into .

As atomic number of sulfur is 16 and its electronic distribution is 2, 8, 6. So, in order to attain stability it will need to gain two electrons. And, by gaining two electrons a neutral atom of sulfur will change into ion.

So, one sulfur atom will che mically react with two potassium atoms in order to gain two electrons. This will result in the formation of compound .

Thus, we can conclude that when potassium and sulfur form a binary ionic compound then the ratio will be 2:1.

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