The charge on the atom containing `17` protons, `18` neutrons and `18` electrons is.

Options

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

Explanation

To determine the charge on an atom containing 17 protons, 18 neutrons, and 18 electrons, we can follow these steps:

### Step 1: Identify the number of protons and electrons
- The atom has **17 protons** and **18 electrons**.

### Step 2: Understand the charges of protons and electrons
- Protons have a **positive charge** (+1).
- Electrons have a **negative charge** (-1).

### Step 3: Calculate the net charge
The net charge of an atom can be calculated using the formula:
\[ \text{Net Charge} = \text{Number of Protons} - \text{Number of Electrons} \]
Substituting the values:
\[ \text{Net Charge} = 17 - 18 \]

### Step 4: Perform the calculation
\[ \text{Net Charge} = -1 \]

### Conclusion
The charge on the atom is **-1**. This indicates that the atom is an anion (negatively charged ion).

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