Step 1:Arsenic (EN = 2.18) is less electronegative than oxygen (3.44) soarsenic is the central atom.

You are watching: Aso4 3- polar or nonpolar

Step 2:The total number of valence electrons present in AsO43- is:

Group Valence Electrons

As 5A 1 × 5 e– =5 e–

O 6A 4 × 6 e– =24 e–

From -3 charge: +3e-

Total: 32 valence e–

Step 3:The Lewis Structure is:

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Step 4: There are 4 domains or groups around central element As:

4 O atoms= 4 domains

• It will need 4 orbitals to accommodate these 4 groups.

Orbitals that can be used by the central atom:

Subshell Total # of orbitals

s _ 1 orbital

p _ _ _ 3 orbitals

d _ _ _ _ _ 5 orbitals

1 s orbital + 3 p orbitals = 4 orbitals (4 groups)

s p p p = sp3


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Problem Details

Draw the Lewis structure of ASO43- showing all lone pairs.

What is the hybridization of the central As atom?

a) sp

b) sp2

c) sp3

d) sp3d

e) sp3d2

An AsO43- ion is

a) nonpolar

b) polar

Identify the molecular geometry of AsO43-.

a) linear

b) see-saw

c) square pyramidal

d) trigonal planar

e) t-shaped

f) square planar

g) bent

h) trigonal bipyramidal

i) trigonal pyramidal

j) tetrahedral

k) octahedral

What are the approximate bond angles in ASO43-?

a) 90 degrees

b) 109 degrees

c) 120 degrees

d) 180 degrees


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Frequently Asked Questions


What scientific concept do you need to know in order to solve this problem?

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