The molecule SiH4 has the silicon atom in the center (naturally) and the four hydrogen atoms are arranged very symmetrically at the corners of a tetrahedron, surrounding the silicon atom. Each hydrogen atom shares its single electron with the silicon, and the silicon shares its four valence electrons evenly with the four hydrogen atoms.
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tetrahedral
I'm unsure what the electron pair geometry is but the molecular geometry is Trigonal Planar.
electron pair geometry: octahedral molecular geometry: octahedral
Tetrahedral.
octahedral