Tetrahedral.
Si can [and will naturally try to] create four bonds with its electrons to fill its valence shell. The other four atoms in this molecule have a charge of -1 each, so all four of these atoms will bond directly with Si and space themselves out to maximum distance of each other. Four electron domains = tetrahedral.
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The molecular geometry is octahedral.
The molecular geometry of C2H2Br2 is trigonal planar.The molecular geometry of C2H2Br2 is trigonal planar.
The molecular geometry of secl2 is BENT.
See-saw is the molecular geometry, and trigonal bi-pyramidal is the orbital geometry.
Molecular geometry is tetrahedral has no lone pairs