To determine the overall charge of a nitride ion, we need to consider the number of protons and electrons present in the ion. Protons have a positive charge (+1), and electrons have a negative charge (-1).
1. First, let's identify the number of protons and electrons in the nitride ion:
- Protons: 7 (each with a charge of +1)
- Electrons: 10 (each with a charge of -1)
2. Next, we calculate the total positive charge contributed by the protons:
- Total positive charge = 7 protons (+1 charge per proton) = +7
3. Then, we calculate the total negative charge contributed by the electrons:
- Total negative charge = 10 electrons (-1 charge per electron) = -10
4. To find the overall charge of the ion, we sum the total positive and negative charges:
- Overall charge = Total positive charge + Total negative charge
- Overall charge = +7 + (-10)
- Overall charge = 7 - 10
- Overall charge = -3
Therefore, the overall charge on this nitride ion is -3. Hence, the correct answer is [tex]$-3$[/tex].
