To determine the number of atoms in one formula unit of **calcium phosphate**, \( \text{Ca}_3(\text{PO}_4)_2 \), we need to break it down and count the individual atoms.

The formula unit is \( \text{Ca}_3(\text{PO}_4)_2 \), which means:
- **3 calcium (Ca) atoms**
- **2 phosphate groups (PO₄²⁻)**, and each phosphate group has:
  - 1 phosphorus (P) atom
  - 4 oxygen (O) atoms

### Now let's calculate the total number of atoms:
- **Calcium (Ca):** 3 atoms
- **Phosphorus (P):** \( 2 \times 1 = 2 \) atoms (since there are 2 phosphate groups)
- **Oxygen (O):** \( 2 \times 4 = 8 \) atoms (4 oxygen atoms per phosphate group)

### Total number of atoms:
- **Calcium (Ca):** 3
- **Phosphorus (P):** 2
- **Oxygen (O):** 8

Therefore, the total number of atoms in one formula unit of \( \text{Ca}_3(\text{PO}_4)_2 \) is:
\[
3 + 2 + 8 = 13 \text{ atoms}
\]

Would you like further details on the atomic structure or any related concept?

Here are 5 follow-up questions to expand on this information:
1. How do you determine the molar mass of \( \text{Ca}_3(\text{PO}_4)_2 \)?
2. What is the significance of the phosphate ion \( (\text{PO}_4^{3-}) \) in chemistry?
3. How would you balance a chemical equation involving calcium phosphate?
4. What is the molecular geometry of the phosphate ion?
5. How is calcium phosphate used in biological systems, such as bones and teeth?

**Tip:** Understanding how to count atoms in a compound is key to mastering chemical formulas and reactions. Always break down polyatomic ions first!

Learn how to count the total number of atoms in calcium phosphate (Ca3(PO4)2) with a detailed breakdown of calcium, phosphorus, and oxygen atoms. This solution explains the structure of the compound and provides a total count of 13 atoms. Suitable for students in Grades 9-12.

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