Protons carry a positive charge, while electrons carry a negative charge. When the number of protons and electrons in an atom is equal, the positive and negative charges cancel each other out, resulting in a net charge of zero. This means that the atom as a whole is electrically neutral.
For example, consider a helium atom. A helium atom has two protons and two electrons. The two protons carry a total positive charge of +2, while the two electrons carry a total negative charge of -2. Since the positive and negative charges are equal, the helium atom is electrically neutral.
The same principle applies to all atoms. As long as the number of protons and electrons in an atom is equal, the atom will be electrically neutral.
