Which particle has: 7 protons, 8 neutrons and 7 electrons?

Question

BlackTom AI · Accepted Answer

The question asks to identify the particle with 7 protons, 8 neutrons, and 7 electrons. 
First, note that the number of protons (7) defines the element (its atomic number Z = 7). An element with Z = 7 is nitrogen, symbol N.
Next, the number of neutrons is 8, which together with 7 protons gives a mass number A = Z + N = 7 + 8 = 15, so this matches nitrogen-15 if needed for isotopic specification.
Finally, the number of electrons is 7. In a neutral atom, the number of electrons equals the number of protons, so having 7 electrons is consistent with a neutral nitrogen atom (no net charge).
Now evaluate the options:
- O: This option would correspond to oxygen, which has 8 protons (Z = 8). Since our particle has 7 protons, this cannot be O. The mismatch in atomic number immediately rules it out.
- N1-: This would be a nitrogen-based species with a 1- charge, meaning it would have 8 electrons (since electrons increase with negative charge). Our particle has 7 electrons, so this option fails due to the incorrect electron count and charge state.
- Ne: Neon has 10 protons (Z = 10). The given proton count is 7, so this is not Ne.
- N: This corresponds to nitrogen with Z = 7. With 7 protons and 7 electrons, the atom would be neutral, and 8 neutrons yields mass number 15, which is consistent with the provided counts. Therefore, this option matches all specified quantities.
In summary, the combination of 7 protons, 8 neutrons, and 7 electrons aligns with a neutral nitrogen atom (nitrogen-15), whereas the other options fail due to incorrect proton count, incorrect electron count/charge, or incorrect element identity.

HonNxtGenChem A NGC Module 3 - Practice Quiz

Which particle has: 7 protons, 8 neutrons and 7 electrons?

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