The number of bond pairs is X and lone pairs is Y on Xe (central atom) in `XeO_(3)F_(2)`. What is the sum of `X+Y`?

Answer

To solve the problem of finding the sum of bond pairs (X) and lone pairs (Y) on the central atom (xenon) in the compound \(XeO_3F_2\), we can follow these steps:

### Step 1: Determine the Valence Electrons of Xenon
Xenon (Xe) is a noble gas and has 8 valence electrons in its outer shell.

### Step 2: Identify the Bonds Formed
In \(XeO_3F_2\):
- Xenon forms **2 single bonds** with the two fluorine (F) atoms.
- Xenon forms **3 double bonds** with the three oxygen (O) atoms.

### Step 3: Calculate Electrons Used in Bonding
- Each single bond with fluorine uses **1 electron** from xenon. Therefore, 2 electrons are used for the two F atoms.
- Each double bond with oxygen uses **2 electrons** from xenon. Therefore, 6 electrons are used for the three O atoms (3 double bonds).

### Step 4: Total Electrons Used in Bonding
- Total electrons used = Electrons used for F + Electrons used for O
- Total = 2 (for F) + 6 (for O) = **8 electrons**.

### Step 5: Determine Lone Pairs
Since all 8 valence electrons of xenon are used for bonding, there are **0 electrons left** for lone pairs.
- Therefore, the number of lone pairs (Y) = **0**.

### Step 6: Calculate Bond Pairs
The total number of bond pairs (X) is calculated as follows:
- 2 bond pairs from the two F atoms (single bonds).
- 3 bond pairs from the three O atoms (double bonds).
- Total bond pairs = 2 (from F) + 3 (from O) = **5**.

### Step 7: Find the Sum of X and Y
Now, we can find the sum:
- \(X + Y = 5 + 0 = 5\).

### Final Answer
The sum of bond pairs (X) and lone pairs (Y) on the central atom in \(XeO_3F_2\) is **5**.

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