If a proton and an electron are combined, the resulting atom would have no net charge. This is because the proton carries a positive charge of +1, while the electron carries a negative charge of -1. These charges balance each other out when they are combined, resulting in an atom with a neutral overall charge.
In an atom, the number of protons in the nucleus determines the atom's atomic number and defines its identity as a specific element. The number of electrons surrounding the nucleus is equal to the number of protons, ensuring overall neutrality. Therefore, when a proton and an electron are combined, they form a hydrogen atom, which has one proton and one electron and is electrically neutral.