Problem: 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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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:

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Problem Details

The figure that follows contains ball-and-stick drawings of three possible shapes of an AF4 molecule.

i) Square planar ii) Tetrahedral iii) Seesaw

Which of the following elements will lead to an AF4 molecule with the shape in (iii): Be, C, S, Se, Si, Xe?