Question

Indicate the molecular geometry, electronic geometry and polarity of the following molecules or ions??

Indique la geometría molecular, geometría electrónica y polaridad de las siguientes
moléculas o iones:
a) BrF5 ´
b) SO42-

Answer 1

Here's what I get.

Explanation:

a) `"BrF"_5`

The Lewis structure is

The central `"Br"` atom has six electron domains, so the electron geometry is octahedral.

The molecular geometry is square pyramidal.

All the `"Br-F"` bonds are polar,

The two opposing pairs in the horizontal plane cancel each other.

However, the vertical bond dipole has no opposing partner, so the molecule is polar.

**b) `"SO"_4^"2-"`

The Lewis structure is

Note that this is only one of several possible Lewis structures and that all `"S-O"` bonds are equivalent because of resonance.

The central `"S"` atom has four electron domains. It has no lone pairs, so the electron geometry and the molecular geometry are tetrahedral.

All the `"S-O"` bonds are polar and equivalent to each other, despite their appearance in the image above.

The bond dipoles along the "single" bonds have a resultant in the plane of the screen and pointing toward the upper left-hand corner of the image.

The bond dipoles along the `"S=O"` bonds have an equal and opposite resultant,

The two resultants cancel, so the ion is nonpolar.