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Nitrogen is an essential element in the periodic table and plays a critical role in various compounds and molecules.
One of the fundamental aspects of chemistry is knowing how to determine the number of protons and electrons in an atom or a molecule. Nitrogen atoms, identified by the chemical symbol 'N', possess 7 protons in their nucleus. This atomic number is consistent across all nitrogen atoms, making it a defining characteristic of the element.

In neutral atoms or molecules, the number of electrons equals the number of protons, maintaining an overall charge of zero. For instance, a single nitrogen atom contains 7 electrons. However, in molecular ions, this balance can shift, leading to variations in electron counts.

Molecular ions are entities with an overall electrical charge due to the loss or gain of electrons. This charge influences the count of electrons present in the molecule. To determine the electron count in molecular ions, one must consider the overall charge of the ion.

A negative charge indicates the gain of electrons, while a positive charge implies the loss of electrons. For example, an \(N_{3}^{-}\) ion, which carries a -1 charge, has gained an extra electron in addition to the standard electron count of a neutral molecule. Consequently, the total electron count exceeds the number of protons by the magnitude of the negative charge. It is vital to understand this relationship to accurately calculate the electron count in molecular ions.

To calculate the number of protons and electrons in a molecule, we first establish the number of constituent atoms and their respective charges if any.

For protons, the task is relatively straightforward: multiply the number of atoms by the atomic number of the element, which is the number of protons in a single atom. With nitrogen, each atom contributes 7 protons.

For electrons, the calculation varies slightly based on the molecule's charge. In a neutral molecule like \(N_{2}\), the total number of electrons is equal to the number of protons. However, in charged molecules or ions, the electron count will be adjusted by adding an electron for each negative charge or subtracting one for each positive charge. Remember, protons remain unaltered in quantity regardless of the molecule's charge; only the electron count is affected.