How many electrons are present in S2-

S2- refers to the sulfur ion that carried a negative charge of two. This means that the sulfur atom gained two electrons in the process of becoming an ion, giving the atom a total of 18 electrons.

Explanation:

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.