Question

A) A nitrogen ion has a mass of 14 and a charge of +2. Which subatomic particles does it contain?
(1 point)
7 protons, 7 neutrons, and 5 electrons
7 protons, 7 neutrons, and 9 electrons
2 protons, 6 neutrons, and 6 electrons
4 protons, 4 neutrons, and 6 electrons

Answer 1

To determine the number of subatomic particles in a nitrogen ion with a mass of 14 and a charge of +2, let's break it down:

1. **Nitrogen** has an atomic number of 7, which means it has **7 protons**.
2. The mass number is the total number of protons and neutrons. Since the mass is 14, we can calculate the neutrons:
\[
\text{Neutrons} = \text{Mass} - \text{Protons} = 14 - 7 = 7 \text{ neutrons}
\]
3. A +2 charge indicates that the ion has lost 2 electrons. Since a neutral nitrogen atom would have 7 electrons (equal to the number of protons), this ion would then have:
\[
\text{Electrons} = 7 - 2 = 5 \text{ electrons}
\]

Putting it all together, this nitrogen ion has:
- 7 protons
- 7 neutrons
- 5 electrons

So the correct choice is:
**7 protons, 7 neutrons, and 5 electrons.**