The answer to each of the following is a non-negative integer.
The number of lone pairs in `O_3` molecule is

Answer

To find the number of lone pairs in the ozone molecule (O₃), we can follow these steps:

### Step 1: Understand the Structure of Ozone
Ozone (O₃) consists of three oxygen atoms. Each oxygen atom has 6 valence electrons, as oxygen is in group 16 of the periodic table.

### Step 2: Calculate Total Valence Electrons
Since there are three oxygen atoms, the total number of valence electrons in O₃ is:
\[ 3 \text{ (O)} \times 6 \text{ (valence electrons per O)} = 18 \text{ valence electrons} \]

### Step 3: Draw the Lewis Structure
To draw the Lewis structure for O₃:
1. Connect the three oxygen atoms. Typically, one oxygen atom is central, and the other two are bonded to it.
2. Use a double bond between the central oxygen and one of the outer oxygens, and a single bond with the other outer oxygen.

### Step 4: Distribute Electrons
After forming the bonds:
- The double bond uses 4 electrons (2 pairs) between the central oxygen and one outer oxygen.
- The single bond uses 2 electrons (1 pair) between the central oxygen and the other outer oxygen.

This accounts for:
\[ 4 \text{ (double bond)} + 2 \text{ (single bond)} = 6 \text{ electrons used} \]

### Step 5: Calculate Remaining Electrons
Now, subtract the used electrons from the total valence electrons:
\[ 18 \text{ (total)} - 6 \text{ (used)} = 12 \text{ electrons remaining} \]

### Step 6: Assign Lone Pairs
Distribute the remaining 12 electrons as lone pairs:
- Each oxygen atom needs to complete its octet (8 electrons).
- The outer oxygens will each have 3 lone pairs (6 electrons) and 1 bond (2 electrons) to the central oxygen.
- The central oxygen will have 1 lone pair (2 electrons) and 2 bonds (4 electrons).

### Step 7: Count the Lone Pairs
- Each outer oxygen has 3 lone pairs (6 electrons).
- The central oxygen has 1 lone pair (2 electrons).

Thus, the total number of lone pairs in O₃ is:
\[ 3 \text{ (from one outer O)} + 3 \text{ (from the other outer O)} + 1 \text{ (from the central O)} = 7 \text{ lone pairs} \]

### Final Answer
The number of lone pairs in the ozone molecule (O₃) is **4**.

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