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In inorganic chemistry, aromaticity can also occur in rings containing atoms other than carbon. Such systems are called inorganic aromatic compounds. The aromatic character of sulfur–nitrogen rings can be examined using the Hückel rule, according to which a cyclic, conjugated and approximately planar system is aromatic when it contains (4n+2) π-electrons. In sulfur–nitrogen systems, each sulfur atom contributes two π-electrons, while each nitrogen atom contributes one π-electron to the delocalized π-system. This electron-rich description is commonly used for S–N aromatic rings. ([Library and Archives Canada][1]) For the species given, the π-electron count can therefore ___ ___ _______ ____ _________.
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