The charge on the atom containing 8 protons, 9 neutrons and 9 electrons is

Options

A. -1
B. +1
C. zero
D. -2

Answer

To determine the charge on an atom containing 8 protons, 9 neutrons, and 9 electrons, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Number of Protons and Electrons:**
- The atom has **8 protons** and **9 electrons**.

2. **Determine the Charge Contribution:**
- Protons are positively charged, and each proton contributes a charge of +1.
- Electrons are negatively charged, and each electron contributes a charge of -1.

3. **Calculate the Total Charge:**
- The total positive charge from protons = Number of protons × Charge of each proton
\[ = 8 \times (+1) = +8 \]
- The total negative charge from electrons = Number of electrons × Charge of each electron
\[ = 9 \times (-1) = -9 \]

4. **Combine the Charges:**
- Total charge of the atom = Total positive charge + Total negative charge
\[ = +8 + (-9) = +8 - 9 = -1 \]

5. **Conclusion:**
- Since there is one more electron than protons, the atom has a **net charge of -1**.

### Final Answer:
The charge on the atom is **-1**.

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