Final answer:
In neutral atoms, the two particles found in equal numbers are protons, which have a positive charge, and electrons, which have a negative charge. Their equal numbers ensure the atom has no net charge.
Step-by-step explanation:
The two particles that are always found in equal numbers in neutral atoms are protons and electrons. Protons are positively charged particles found in the nucleus of an atom, whereas electrons are negatively charged particles that orbit the nucleus. In neutral atoms, the number of protons inside the nucleus is equal to the number of electrons orbiting around it. This equality is necessary to balance out the charges, ensuring that the overall charge of the atom is zero. Neutrons, on the other hand, are neutral particles that also reside within the nucleus along with protons, and they do not have a role in determining the electrical neutrality of an atom.