The element Tellurium has an atomic number of 52. If the mass number of a tellurium atom is 128, that atom has a total of ___ subatomic particles inside the nucleus, and ___ subatomic particles outside the nucleus.
The number of subatomic particles inside the nucleus is equal to the sum of protons and neutrons. Since the atomic number of tellurium is 52, it has 52 protons. To find the number of neutrons, we subtract the atomic number from the mass number: 128 - 52 = 76 neutrons.
So, the total number of subatomic particles inside the nucleus is 52 (protons) + 76 (neutrons) = 128 subatomic particles.
The number of subatomic particles outside the nucleus is equal to the number of electrons, which is equal to the number of protons in a neutral atom. Therefore, the atom of tellurium with a mass number of 128 has 52 electrons outside the nucleus.