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K2S, potassium sulfide, is ionic, which is neither polar nor nonpolar. The 2 potassium atoms lose 1 electron each, and the sulfur atom gains the 2 electrons from the potassium atoms. The potassium atoms become positively charged ions, K+, and the sulfur atom becomes a negative ion, S2-, which is now called a sulfide ion. The electrostatic attraction between oppositely charged ions forms the ionic bonds between them, forming the ionic compound potassium sulfide, K2S.
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