The charge on the atom having 15 protons, 18 electrons is

Options

A. `-3`
B. `-1`
C. `-2`
D. zero

Explanation

To determine the charge on an atom with 15 protons and 18 electrons, we can follow these steps:

### Step 1: Identify the number of protons and electrons
- The atom has **15 protons** and **18 electrons**.

### Step 2: Understand the charges of protons and electrons
- Each proton has a charge of **+1**.
- Each electron has a charge of **-1**.

### Step 3: Calculate the total positive charge from protons
- Total positive charge from protons = Number of protons × Charge of each proton
- Total positive charge = 15 protons × (+1) = **+15**.

### Step 4: Calculate the total negative charge from electrons
- Total negative charge from electrons = Number of electrons × Charge of each electron
- Total negative charge = 18 electrons × (-1) = **-18**.

### Step 5: Calculate the overall charge of the atom
- Overall charge = Total positive charge + Total negative charge
- Overall charge = +15 + (-18) = **-3**.

### Conclusion
- The charge on the atom is **-3**.

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