Answer:
Francium has fewer valence electrons, but they are in a higher energy level
The correct answer is b i believe
"The proton and neutron have nothing to do with the isotope little billy"
Answer:
8.61 min
Explanation:
original mass= 12.65
first half life = 12.65/2 = 6.325
second half life = 6.325/2 = 3.1625
Note : 3.1625 is the closest to the value (3.115) given so we work with it
total time for decay =17.22
therefore two decays = 17.22/2= 8.61
