1. An atom of
14
 C contains protons and neutrons.
6

How many protons and neutrons are there?

 
number of neutrons
number of protons
A.
14
6
B.
8
6
C.
6
8
D.
6
14
 

2+3: These questions refer to this diagram of an atom of a common element.

 diagram of an atom

2. What is the atomic number?

A). 3
B). 4
C). 7
D). 10
3. What is the nucleon (mass) number?

A). 3
B). 4
C). 7
D). 10

 
4. Two isotopes of the same element have ...

A). the same number of protons but different numbers of neutrons.
B). the same number of protons but different numbers of electrons.
C). the same number of neutrons but different numbers of protons.
D). the same number of electrons but different numbers of protons.
5. An atom that has been ionised has ...

A). Lost or gained protons
B). Lost or gained electrons
C). Lost or gained a nucleon
D). Lost or gained a neutron
6. A radioactive isotope is a substance that ...

A). will eventually gain electrons through bonding.
B). will become stable by cooling down.
C). is unstable and will ‘decay’ by losing particles.
D). is not found naturally on the Earth.

The next set of questions are about types of radiation.

Which type(s) of radiation match the following descriptions?
radiation hazsign
7. The most ionising.
8. A fast moving electron.
9. Can pass through paper.
10. The same as a helium nucleus.

11. When Uranium decays it emits an alpha particle, forming an isotope of Thorium. Which of the following decay equations is correct?

A.
238
 U
232
 Th
+
2
 α
92
90
2
B.
238
 U
236
 Th
+
2
 α
92
90
2
C.
238
 U
234
 Th
+
4
 α
92
90
2
D.
238
 U
232
 Th
+
4

α
92
90
2