tetrahedral arrangement

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Figure 1: The four stable geometric structures of the seven-atom cluster of argon, in order of increasing energy: (A) A pentagonal bipyramid. (B) A regular octahedron with one face capped by the seventh atom. (C) A regular tetrahedron with three of its faces capped by other atoms. (D) A trigonal bipyramid with two of its faces capped by other atoms; although this has the highest energy of the four structures, it is very close in energy to the tricapped tetrahedron.

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tetrahedral arrangement

molecular shape

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chemical bonding

In chemical bonding: Molecular shapes and VSEPR theory
…one another, as in the tetrahedral arrangement of hydrogen atoms around the central carbon atom in methane, CH₄, or the angular arrangement of atoms in H₂O.
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