Electrons within a pure atom are equal to the number of protons in the atom's nucleus. This is a fundamental principle of chemistry and physics known as electrical neutrality.

Here's why:

* Protons: Positively charged particles found in the nucleus of an atom.

* Electrons: Negatively charged particles orbiting the nucleus.

* Neutrality: Atoms naturally seek a balance between positive and negative charges.

Since protons carry a positive charge and electrons carry a negative charge, an equal number of each ensures the atom is electrically neutral. This neutrality is essential for the stability and behavior of atoms and molecules.