C contains electron, protons and neutrons. How many?
6
number of electrons
number of protons
number of neutrons
A.
14
6
14
B.
14
6
8
C.
6
8
6
D.
6
6
8
Look at this diagram of an atom of a common element.
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?
7. The most ionising.
8. A fast moving electron.
9. Can pass through paper.
10. Only stopped by lead.
11. Positively charged.
12. The greatest mass.
13. The same as a helium nucleus.
14. Not a type of electromagnetic radiation.
15. 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
16. What change takes place to an atom during beta decay?
A). A proton changes into a neutron.
B). A proton changes into an electron.
C). An electron changes into a neutron.
D). A neutron changes into a proton.
17.
14
C (carbon - 14) decays into nitrogen through beta decay. What isotope remains?
6
A.
14
N
7
B.
15
N
7
C.
13
N
6
D.
14
N
6
18.In this decay equation, what are the missing numbers x and y?
24
Na
24
Mg
+
y
ß
11
x
-1
A. x=10, y=1
B. x=10, y=0
C. x=12, y=1
D. x=12, y=0
19. The half-life of a substance is
A). the amount of substance left after it has decayed.
B). the time it takes for half of the isotope to decay.
C). the time it takes for half the mass to have radiated away.
D). the mass of half of the isotope after decaying.
20. The activity of an isotope is
A). the number of particles/rays emitted per second.
B). the same as the half-life in seconds.
C). the amount of radiation emitted over the lifespan of the isotope.
