The charge on the atom having 17 protons, 18 electrons is

Options

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

Explanation

To determine the charge on an atom that has 17 protons and 18 electrons, 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 total charge
- The total charge of the atom can be calculated using the formula:
\[ \text{Total Charge} = (\text{Number of Protons}) - (\text{Number of Electrons}) \]
- Plugging in the values:
\[ \text{Total Charge} = 17 - 18 = -1 \]

### Step 4: Interpret the result
- A total charge of **-1** indicates that the atom is negatively charged. This means that it is an anion, specifically because it has gained one extra electron.

### Final Answer
- The charge on the atom having 17 protons and 18 electrons is **-1**.

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