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What is the electron configuration of the S2- ion?

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The S2- ion, the simplest sulfur anion and also known as sulfide, has an electron configuration of 1s2 2s2 2p6 3s2 3p6. A neutral atom of sulfur has 16 electrons, but the atom then gains an additional two electrons when it forms an ion, taking the total number of electrons to 18.

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In S2-, sulfur forms a negative ion, also known as an anion, which means that it is necessary to add two ions to the original electron configuration of neutral sulfur.

Sulfide is a very strong base, which means that all solutions of sulfide in water are also basic because of hydrolysis. Due to the hydrolysis, all solutions of sulfide in water have a smell similar to rotten eggs. When sulfide is mixed with water, it takes on one proton from the H2O, which results in one molecule of SH- and one molecule of OH-. When sulfide is mixed with an acid, it forms H2S, known as hydrogen sulfide, and a metal salt.

Sulfide is found in many important metal ores, such as argentite, molybdenite, galena and cinnabar. Argentite is a silver sulfide, galena is a lead sulfide, cinnabar is a mercury sulfide and molybdenite is a molybdenum sulfide. Lead sulfite is often used in infrared lasers.

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