Explanation:

BrF5 (Bromine pentafluoride), TeF5- (Tellurium pentafluoride anion), and XeF5 (Xenon pentafluoride) are all compounds with five fluorine atoms bonded to a central atom. However, XeF5- (Xenon pentafluoride anion) is the one that has a different shape compared to the others.

Shapes of molecules:

The shape of a molecule is determined by its electron geometry and the positions of the surrounding atoms. In this case, all four compounds have five fluorine atoms surrounding a central atom, but the central atom and the arrangement of the fluorine atoms differ.

BrF5 (Bromine pentafluoride):

In the case of BrF5, the central atom is bromine (Br) and it has one lone pair of electrons and five bonded fluorine (F) atoms. The electron geometry is octahedral, with the lone pair and the five fluorine atoms arranged in a trigonal bipyramidal shape. The lone pair of electrons occupies one of the equatorial positions, resulting in a square pyramidal molecular shape.

TeF5- (Tellurium pentafluoride anion):

TeF5- is a negatively charged ion known as the tellurium pentafluoride anion. It has a central tellurium atom (Te) surrounded by five fluorine (F) atoms. The electron geometry is also octahedral, with no lone pairs of electrons. The five fluorine atoms are arranged in a trigonal bipyramidal shape, resulting in a square pyramidal molecular shape.

XeF5 (Xenon pentafluoride):

XeF5 is a neutral molecule with a central xenon atom (Xe) bonded to five fluorine (F) atoms. The electron geometry is also octahedral, with no lone pairs of electrons. The five fluorine atoms are arranged in a trigonal bipyramidal shape, resulting in a square pyramidal molecular shape, similar to BrF5 and TeF5-.

XeF5- (Xenon pentafluoride anion):

XeF5- is a negatively charged ion known as the xenon pentafluoride anion. It has a central xenon atom (Xe) surrounded by five fluorine (F) atoms. However, unlike the other compounds, XeF5- has one lone pair of electrons on the central atom. This changes the electron geometry to square pyramidal, with the lone pair occupying one of the equatorial positions. Therefore, XeF5- has a different shape compared to the other compounds.

Conclusion:

Among the given options, XeF5- (Xenon pentafluoride anion) is the compound that has a different shape compared to the others. It has a square pyramidal molecular shape due to the presence of a lone pair of electrons on the central xenon atom, whereas the others have a trigonal bipyramidal shape.