What is the difference between the isotopes Uranium-238 and Uranium-235?
Answer
Uranium-238 has three more protons.
Uranium-238 has three more neutrons.
Uranium-238 has three more electrons.
There is no difference.
Question 2
Question
An alpha particle is the same as a(n) ___.
Answer
helium nucleus
beta particle
hydrogen nucleus
electron
Question 3
Question
Nuclear fusion produces energy when ___.
Answer
two atomic nuclei combine
an atomic nucleus splits
a chemical reaction occurs
helium transmutes into hydrogen
Question 4
Question
Nuclear fission converts ___.
Answer
small atoms into larger atoms
small amounts of mass into energy
small amounts of energy into mass
small atoms into molecules
Question 5
Question
An unstable nucleus ____.
Answer
increases its nuclear mass by fission
expels all of its protons
increases its half-life
emits energy when it decays
Question 6
Question
The identity of an element, the atomic number, is determined by its number of _.
Answer
Electrons
Neutrons
Protons
Question 7
Question
Which radiation has the poorest penetration (lowest ionization energy) but can cause the most damage to a cell?
Answer
Alpha particles
Beta particles
Gamma rays
They all have the same strength
Question 8
Question
What particle is needed to complete this nuclear reaction?
222 Rn → 218 Po + ____
86 84
Answer
4 α
2
0 ẞ
-1
0 γ
0
1 n
0
Question 9
Question
When a uranium-235 nucleus is struck with a neutron, xenon-144 and strontium-90 nuclei are produced, along with some neutrons. How many neutrons are produced?
Answer
0
1
2
3
Question 10
Question
The iodine-131 nuclide has a half-life of 8.0 days. If you originally have a sample containing 728-g of I-131, after 48 days you will have ___.