PS Unit 3 Review

Alpha particles.....

• a) are positively charged.
• b) consist of two protons and four neutrons.
• c) can penetrate any thickness of matter
• d) All of the above 

Radioactive materials have unstable...

• electrons
• protons
• nuclei
• neutrons

Negatively charged particles emitted from a nucleus at a high speed are ____.  

• alpha particle
• gamma rays
• beta particles
• X rays

Two atoms of the same element but with different mass numbers are called________

• electrons
• isotopes
• ions
• reaction partners

What do these isotopes of carbon all have in common?

¹²₆C, ¹³₆C, ¹⁴₆C

• they all have the same number of neutrons & mass number

• they all have the same atomic number and neutrons

• they all have the same atomic number and electrons

• they all have the same number of protons, atomic number, and mass number

In order of most to least penetrating radiation we have

• Alpha , Beta,  Gamma
• Beta , Gamma , Alpha
• Gamma, Beta, Alpha
• Gamma, Alpha, Beta

Has the symbol

• Alpha
• Beta 
• Gamma

Has the symbol

• Alpha
• Beta
• Gamma

Has the symbol

• Alpha
• Beta
• Gamma

The % of the parent isotope remaining after 1 Half Life.

• 50%

• 25%

• 12.5%

• 6.25%