Final answer:
The Te2- ion has 52 protons, 54 electrons due to the 2- charge, and if we assume a mass number of 125 based on an example, it has 73 neutrons.
Step-by-step explanation:
To determine the number of protons, neutrons, and electrons in a Te2- ion, we look at its atomic number and mass number. Tellurium (Te) has an atomic number of 52, which means every Te atom has 52 protons. The number of electrons in a neutral Te atom would also be 52, but since this is a Te2- ion, it has gained two electrons, so it has 54 electrons. To find the number of neutrons, we look at the mass number provided. For example, if we have Te with a mass number of 125, the number of neutrons is the mass number minus the atomic number: 125 - 52 = 73 neutrons.