Use the radioactivity website to answer the questions below:

1.

What name did J.J. Thompson's model for the structure of an atom become known as?

2.

What did Ernest Rutherford fire at a thin sheet of Gold foil?

3.

Complete the sentence: At the centre of the atom…

4.

What is the charge on a proton?

5.

What is the charge on a neutron?

6.

What is the charge on an electron?

7.

What is the mass of a proton?

8.

What is the mass of a neutron?

9.

What is the mass of an electron?

10.

Complete the sentence: The atomic number of an atom = …

11.

Complete the sentence: The neutron number of an atom = …

12.

Complete the sentence: The mass number of an atom = …

13.

What is the atomic number of Helium?

14.

What is the mass number of Lithium?

15.

If the atomic number of Nitrogen = 7 how many protons are in an atom's nucleus?

16.

What is the mass number of Deuterium?

17.

What is Deuterium?

18.

What are the isotopes of unstable atoms called?

19.

Complete the sentence: Radioactivity is the emission of…

20.

What are the three ways that a radioisotope can lose energy?

21.

Write down three properties of alpha particles.

22.

Write down three properties of beta particles.

23.

Write down three properties of gamma rays.

24.

Complete the sentence: When radiation collides with a neutral atom (or molecule)…

25.

What material stops the penetration of alpha particles?

26.

Which particle is deflected the most by an electric field?

27.

What is the ionising power of gamma rays?

28.

Who discovered radioactivity?

29.

What kind of film can be used to detect radioactivity?

30.

A Geiger Muller tube can detect radioactivity. What gas fills the inside of the tube?

31.

Name five sources of background radiation.

32.

Which is the biggest source of background radiation?

33.

Complete the sentence: The half-life of a radioisotope is…

34.

What is the half-life of Carbon-14?

35.

What is the half-life of Plutonium-239?

36.

Outside the body which is the most harmful radiation?

37.

Inside the body which is the most harmful radiation?

38.

Name three uses of radioisotopes?

39.

What three factors are important when selecting a radioisotope for medical use?

40.

What is the name of the radioisotope used in smoke detectors?

41.

What does the term nuclear fission mean?

42.

How many protons does a Uranium atom have in its nucleus?

43.

Which process gives the most energy, nuclear fission or formation of a chemical bond?

44.

What is a chain reaction?

45.

How many steps does it take Uranium-238 to decay into stable Lead?

46.

How old is a rock that has a Uranium:Lead ratio of 1:1?

47.

What is the name of another radioisotope that can be used to date rocks?

48.

What is the stable decay product of Potassium-40?

49.

What is the name of the radioisotope that is used to date living things that have died?

50.

If an ancient fossil has a ratio of Carbon-14:Nitrogen-14 of 1:7, how old is it?