in the model screen, build a molecule with 5 atoms attached to the central atom. look at the molecular geometry and electron geometry. predict what will happen to the molecule geometry as you replace atoms with lone pairs

The replacement of atoms with lone pairs will result in the change of the molecular geometry from trigonal bipyramidal to see-saw by 1 atom replacement, T shaped by two atom replacement, and linear by 3 atoms replacement.

The shape of the molecule with 5 atoms attached to the central atom has been trigonal bipyramidal. The molecular geometry of the molecule as atoms are replaced with the lone pairs.

By the replacement of the atoms with lone pairs, the following geometry changes are observed:

No further change in the molecular geometry has been possible with the linear geometry.

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The molecular geometry of the molecule changes as atoms are replaced with lone pairs

Explanation:

A molecule having five atoms attached to a central atom possesses five electron domains and is expected to have a trigonal bipyramidal electron and molecular geometry. The axial bonds are expected to be at an angle of 90 degrees while the equatorial bonds are expected to be at an angle of 120 degrees.

However, if one of the atoms is replaced with a lone pair, the electron geometry remains trigonal bipyramidal but the molecular geometry changes to  see-saw. both equatorial and axial bonds are now less than 120 degrees and 90 degrees respectively.

If two atoms are replaced by lone pairs, the electron geometry remains trigonal bipyramidal but the molecular geometry changes to T shaped with a bond angle less than 90 degrees.

If three atoms are replaced by lone pairs, the electron geometry remains trigonal bipyramidal while the molecular geometry changes to linear with a bond angle of 180 degrees.

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