Gamma rays are unlike alpha and beta particles because gamma rays:
are more strongly deflected by electric or magnetic fields
have less energy than either alpha or beta particles
have more mass than either alpha or beta particles
have no effect on atomic number or mass number of the atoms that emit them

I would say the last one because unlike beta and alpha rays they will have no effect on the mass or atomic number because they are just composed of high energy radiation

have no effect on atomic number or mass number of the atoms that emit them.

Explanation:

Unlike alpha and beta particles gamma rays are weightless packets of energy which have both mass and energy. Gamma rays are more like visible light but they have much higher energy. Based on this option D is true because gamma rays have no mass that is why they have no effect on atomic number of the atoms that emit them.

18

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.