State the number of neutrons and protons in each of the following nuclei:

: ________________________________________________________

: ________________________________________________________

: _______________________________________________________

: _______________________________________________________

2. Complete the following Table:

	Charge	Mass	Greek Symbol	Equation Symbol	Can Be Stopped By
Alpha
Beta
Gamma

3. Which of the three radioactive emissions (, , ) best fit the following statements? Write the correct symbol(s) on the lines.

These emissions are charged : ___________________________________________________________

This emission is the most massive (heaviest): ____________________________________________________________

This emission is the most charged: ___________________________________________________________

This emission is most dangerous outside of the body: ___________________________________________________

This emission is stopped by thin paper or a few centimeters of air: ____________________________________

This emission can travel through paper, but is stopped by aluminum: _________________________________

This emission can travel through fairly thick lead: _______________________________________________________