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An atomic arrangement in which two single chains of silica tetrahedra bond together by sharing the third oxygen in alternate tetrahedra. Feldspar group A group of silicate minerals in which silica tetrahedra are arranged in a framework structure and containing potassium, calcium or sodium cations.
Nitrogen is the anomaly, along with oxygen, because first row elements can form stab;e [math]\pi[/math] bonds. Sulfur is isoelectronic to oxygen, just as phosphorus is to nitrogen. But sulfur and phosphorus cannot form stable [math]\pi[/math] bonds to themselves, and so they exist as single bonded allotropes. S2 and even P2 exist, but only transiently because they are quite unstable with respect to single bonded forms.