Model (iii) has a seesaw molecular geometry, which corresponds to AX4E1 (X = 4 bonding groups, E = 1 lone pair). The number of valence electrons in AF4 is:
The figure that follows contains ball-and-stick drawings of three possible shapes of an AF4 molecule.
Which of the following elements will lead to an AF4 molecule with the shape in (iii): Be, C, S, Se, Si, Xe?
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