What are the excited states and the hybridization of #"AsO"_4^(3-)# and #"PF"_4^-#?

1 Answer
Mar 2, 2015

Answer:

They each have an infinite number of excited states. AsO₄³⁻ is sp³ hybridized. PF₄⁻ has sp³d hybridization.

Explanation:

There are three steps to determining the hybridization of an atom:

  • Draw the Lewis structure
  • Use VSEPR theory to determine its shape.
  • Assign the hybridization.

AsO₄³⁻

The Lewis structure is

AsO4

This is an AX₄ system, so it has a tetrahedral geometry.

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The steric number (lone pairs + bonds to atoms) is 4, so the hybridization is sp³.

PF₄⁻

The Lewis structure shows a P atom with a lone pair and a bond to each of the F atoms.

This is an AX₄E system, so the ion has a seesaw geometry,

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The steric number is 5, so the hybridization is sp³d.