Which of the following symbols would be included in the noble gas notation for an element that had valence electrons in the 5s subshell? Ar
Kr
Xe
Rn

The answer is 65.3312

A.(nh4)(2co3)is the correct answer 

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.