The tetrahedron is the simplest of all polyhedra. Any four points in space that are not all on the same plane mark the corners of four triangles. The triangles in turn are the faces of a ...

Li 2 Se Unit Cell The radii of the ions is: r Li+ = 0.60 Å and r Se2- = 1.98 Å. Since the lithium ion is 30.3% of the selenide ion, we can predict that the selenide ions will occupy the lattice points ...

Researchers have designed and built a new chemical tool inspired by natural metal-containing enzymes in living organisms. The product, a tetrahedral "chiral zinc", maintains its shape for years ...