Chapter 18 Review
1)
Phosphorus-32 decays by beta emission to form sulfur-32.
2)
Francium-212 (21287 Fr) decays by alpha emission.
3)
Fluorine-18 decays to oxygen-18 by positron emission.
4)
Sodium-24 decays by beta emission.
5)
When neptunium-239 decays, plutonium-239 is formed and a particle is
emitted. (Be sure to include the correct particle in the equation.)
6)
________ 
7)
239
93
8)
13
9)
226
88
Ra
10)
208
84
Po 
7
Np 
239
0
-1
14
e +
N
Pu + _________
94
N  _________ +

7
_______
0
+1
222
+
________ +
e
4
2
86
He
Rn
11. The half life of a certain isotope is 374 minutes. How long will it
take for a 75.0g sample to decay to 2.34g?
12. The first order rate constant for the decay of an isotope is 0.617s-1.
What is the half life of the isotope?
13. What type of decay would you expect manganese-45 to undergo?
Arsenic-80?
Name these compounds
Write the formulas