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

You are watching: Write lewis structure for aso3 3

Step 2:The total variety 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 room 4 domains or teams around main element As:

4 O atoms= 4 domains

• that will require 4 orbitals come accommodate this 4 groups.

Orbitals that deserve to be used by the main atom:

Subshell full # the orbitals

s _ 1 orbit

ns _ _ _ 3 orbitals

d _ _ _ _ _ 5 orbitals

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

s p p p = sp3


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Problem Details

Draw the Lewis framework of ASO43- mirroring all lone pairs.

What is the hybridization that the main As atom?

a) sp

b) sp2

c) sp3

d) sp3d

e) sp3d2

An AsO43- ion is

a) nonpolar

b) polar

Identify the molecular geometry that 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 room the almost right bond angles in ASO43-?

a) 90 degrees

b) 109 degrees

c) 120 degrees

d) 180 degrees


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