Question
Nuclear fusion is a reaction that takes place in stars.
Which row describes this reaction?
Answer/Explanation
Ans:
D
Question
Which row correctly states how nuclei behave during nuclear fission and during nuclear fusion?
| fission | fusion |
A | nuclei join together | nuclei join together |
B | nuclei join together | nuclei split apart |
C | nuclei split apart | nuclei join together |
D | nuclei split apart | nuclei split apart |
Answer/Explanation
Ans: C
Question
The charge on a proton is e.
What is the charge on an electron and what is the charge on a neutron?
| electron | neutron |
A | e | e |
B | e | 0 |
C | –e | –e |
D | –e | 0 |
Answer/Explanation
Ans: D
Question
What are isotopes of an element?
A atoms of a different element with a different number of neutrons
B atoms of a different element with a different number of protons
C atoms of the same element with a different number of neutrons
D atoms of the same element with a different number of protons
Answer/Explanation
Ans: C
Question
The notation for an isotope of sodium is 
Na .
Which row gives the composition of a neutral atom of this isotope of sodium?
| number of protons | number of neutrons | number of electrons |
A | 11 | 12 | 11 |
B | 11 | 12 | 12 |
C | 11 | 23 | 11 |
D | 12 | 11 | 12 |
Answer/Explanation
Ans: A