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Please note that "geometry" refers to the molecular or ionic geometry. In the VSEPR model, the geometry of the regions defined by the electron pairs in the valence shell of an atom is called the electron-pair geometry. A. The Lewis diagram for SeH2 is: The electron-pair geometry around the Se atom in SeH2 is There are unshared pair(s) around the central atom, so the geometry of the SeH2 molecule is B. The Lewis diagram for BCl3 is: The electron-pair geometry around the B atom in BCl3 is There are unshared pair(s) around the central atom, so the geometry of the BCl3 molecule is Please note that "geometry" refers to the molecular or ionic geometry. In the VSEPR model, the geometry of the regions defined by the electron pairs in the valence shell of an atom is called the electron-pair geometry. A. The Lewis diagram for H2O is: The electron-pair geometry around the O atom in H2O is There are unshared pair(s) around the central atom, so the geometry of the H2O molecule is B. The Lewis diagram for CH4 is: The electron-pair geometry around the C atom in CH4 is There are unshared pair(s) around the central atom, so the geometry of the CH4 molecule is Please note that "geometry" refers to the molecular or lonic geometry. In the VSEPR model, the geometry of the regions defined by the electron pairs in the valence shell of an atom is called the electron-pair geometry. A. The Lewis diagram for NOBr is: Recall that for predicting geometry, double and triple bonds count as only one electron pair region. The electron-pair geometry around the N atom in NOBr is There are unshared pair(s) around the central atom, so the geometry of the NOBr molecule is B. The Lewis diagram for BeI 2 is: The electron-pair geometry around the Be atom in BeI2 is There are unshared pair(s) around the central atom, so the geometry of the BeI2 molecule is