The shape of `ClO_(3)^(-)` ion according to VSEPR theory is:

Options

A. Triangle planar
B. Pyramidal
C. Tetrahedral
D. square planar.

Explanation

To determine the shape of the \( \text{ClO}_3^{-} \) ion according to VSEPR theory, we can follow these steps:

### Step 1: Determine the Valence Electrons
Chlorine (Cl) is in Group 17 of the periodic table, which means it has 7 valence electrons. Each oxygen (O) atom has 6 valence electrons. Since there are three oxygen atoms, the total number of valence electrons contributed by oxygen is \( 3 \times 6 = 18 \).

Additionally, the \( \text{ClO}_3^{-} \) ion has an extra electron due to its negative charge.

Calculating the total number of valence electrons:
\[ \text{Total valence electrons} = 7 (\text{from Cl}) + 18 (\text{from 3 O}) + 1 (\text{extra electron}) = 26 \]

### Step 2: Draw the Lewis Structure
In the Lewis structure of \( \text{ClO}_3^{-} \):
- Chlorine will be the central atom.
- It will form one single bond with one oxygen atom and two double bonds with the other two oxygen atoms.
- Chlorine will have one lone pair of electrons.

The structure can be represented as follows:
- One Cl-O single bond
- Two Cl=O double bonds
- One lone pair on the chlorine atom

### Step 3: Determine the Steric Number
The steric number is calculated by adding the number of bonded atoms and lone pairs around the central atom (Cl):
- There are 3 bonded oxygen atoms (1 single bond + 2 double bonds).
- There is 1 lone pair of electrons on chlorine.

Thus, the steric number is:
\[ \text{Steric Number} = 3 (\text{bonded atoms}) + 1 (\text{lone pair}) = 4 \]

### Step 4: Predict the Shape Using VSEPR Theory
According to VSEPR theory, a steric number of 4 corresponds to a tetrahedral electron pair geometry. However, since there is one lone pair, the molecular geometry will be different.

The presence of the lone pair will repel the bonded pairs, resulting in a trigonal pyramidal shape for the \( \text{ClO}_3^{-} \) ion.

### Conclusion
The shape of the \( \text{ClO}_3^{-} \) ion according to VSEPR theory is **trigonal pyramidal**.

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