To determine the composition of the nitrogen ion with a mass of 14 and a charge of +2, we need to analyze what we know about nitrogen isotopes and ions.
- Nitrogen's atomic number: Nitrogen has an atomic number of 7, which means it has 7 protons.
- Mass number: The ion has a mass of 14, which indicates that the total number of protons and neutrons is 14. Since there are 7 protons, we can find the number of neutrons: \[ \text{Number of neutrons} = \text{Mass number} - \text{Number of protons} = 14 - 7 = 7 \text{ neutrons} \]
- Ion charge: A charge of +2 indicates that the ion has lost 2 electrons. Normally, a neutral nitrogen atom would have 7 electrons (equal to the number of protons). Therefore, the nitrogen ion will have: \[ \text{Number of electrons} = 7 - 2 = 5 \text{ electrons} \]
Putting this all together, the nitrogen ion (+2 charge) contains:
- 7 protons
- 7 neutrons
- 5 electrons
Thus, the correct answer is: 7 protons, 7 neutrons, and 5 electrons.
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